A lush green mountain with dense forest and a cloudy sky.

Find hotels in Sierra from Rp639.927

  • Change your mind

    Book hotels with free cancellation
  • Treat yourself

    Sign in to save 10% or more on thousands of hotels
    Sign in
  • Be picky

    Search almost a million properties worldwide

Check prices for these dates

Tonight
29 Sept - 30 Sept
Tomorrow
30 Sept - 1 Oct
This weekend
2 Oct - 4 Oct
Next weekend
9 Oct - 11 Oct

Filter by

Star rating

Guest rating

Our top choices for Sierra hotels

1. Amalú Luxury View Cabins

Amalú Luxury View Cabins
Sierra
United States
Alec
Rp1.765.933
Rp1.995.504 total
includes taxes & fees
11 Oct - 12 Oct
Amalú Luxury View Cabins

2. Belcruz Bed & Breakfast

Belcruz Bed & Breakfast
Sierra
United States
Shannon
Rp1.456.218
Rp1.645.526 total
includes taxes & fees
6 Oct - 7 Oct
Belcruz Bed & Breakfast

3. Hotel Bosque Verde Lodge

Hotel Bosque Verde Lodge
Sierra
United States
Shawna
Rp1.634.200
Rp1.846.700 total
includes taxes & fees
1 Oct - 2 Oct
Hotel Bosque Verde Lodge

4. Macas Moon Glamping

Macas Moon Glamping
Sierra
Canada
Ian
Rp2.373.491
Rp2.682.045 total
includes taxes & fees
2 Oct - 3 Oct
Macas Moon Glamping

5. Campos de Oro Wilderness Lodge

Campos de Oro Wilderness Lodge
Sierra
United States
Luidmila
Rp1.456.218
Rp1.645.526 total
includes taxes & fees
1 Oct - 2 Oct
Campos de Oro Wilderness Lodge

6. Tierra Buena Countryside Hotel

Tierra Buena Countryside Hotel
Sierra
Rp1.262.056
Rp1.426.123 total
includes taxes & fees
1 Oct - 2 Oct
Tierra Buena Countryside Hotel

7. Cabañas Don Camilo Lodge

Cabañas Don Camilo Lodge
Sierra
United Kingdom
Mark
Rp566.307
Rp639.927 total
includes taxes & fees
29 Oct - 30 Oct
Cabañas Don Camilo Lodge

8. Delux Manvama Monteverde

Delux Manvama Monteverde
Sierra
Rp2.588.832
Rp2.925.381 total
includes taxes & fees
1 Oct - 2 Oct
Delux Manvama Monteverde

9. Casa Jaspe Monteverde

Casa Jaspe Monteverde
Sierra
Rp2.038.705
Rp2.303.736 total
includes taxes & fees
1 Oct - 2 Oct
Casa Jaspe Monteverde

10. Tranquil Jungle Loft Getaway in Monteverde Cloud Forest

Tranquil Jungle Loft Getaway in Monteverde Cloud Forest
Sierra
Rp1.642.072
Rp1.855.541 total
includes taxes & fees
13 Oct - 14 Oct
Tranquil Jungle Loft Getaway in Monteverde Cloud Forest

11. Macas Moon Glamping Monteverde

Macas Moon Glamping Monteverde
Sierra
Macas Moon Glamping Monteverde

12. Calathea Hotel Monteverde

Calathea Hotel Monteverde
Monteverde
United States
Jim
Rp1.598.963
Rp1.806.789 total
includes taxes & fees
8 Oct - 9 Oct
Calathea Hotel Monteverde

13. Finca Sunset Monteverde

Finca Sunset Monteverde
Monteverde
United States
Barbara
Rp3.678.912
Rp4.157.171 total
includes taxes & fees
6 Oct - 7 Oct
Finca Sunset Monteverde

14. Monteverde Lodge by Böëna

Monteverde Lodge by Böëna
Monteverde
United States
Elizabeth
Rp5.196.360
Rp6.231.447 total
includes taxes & fees
5 Oct - 6 Oct
Monteverde Lodge by Böëna

15. Koora Hotel by Sandglass

Koora Hotel by Sandglass
Monteverde
Mexico
Giovanna
Rp4.171.795
Rp4.714.128 total
includes taxes & fees
2 Oct - 3 Oct
Koora Hotel by Sandglass

16. Ficus Sunset Suites

Ficus Sunset Suites
Monteverde
Canada
Amar
Rp3.847.789
Rp4.348.001 total
includes taxes & fees
17 Oct - 18 Oct
Ficus Sunset Suites

17. Hotel con Corazón Monteverde

Hotel con Corazón Monteverde
Monteverde
United Kingdom
Rick
Rp1.024.560
Rp1.157.753 total
includes taxes & fees
1 Oct - 2 Oct
Hotel con Corazón Monteverde

18. Valle Escondido Nature Reserve Hotel & Farm

Valle Escondido Nature Reserve Hotel & Farm
Monteverde
United Kingdom
Charlotte
Rp2.157.360
Rp2.437.817 total
includes taxes & fees
1 Oct - 2 Oct
Valle Escondido Nature Reserve Hotel & Farm

19. Arenal Observatory Lodge & Trails

Arenal Observatory Lodge & Trails
La Fortuna
Mexico
Jorge Isai
Rp2.054.026
Rp2.321.050 total
includes taxes & fees
1 Oct - 2 Oct
Arenal Observatory Lodge & Trails

20. Hotel & Spa Poco a Poco

Hotel & Spa Poco a Poco
Monteverde
United States
Sarah J
Rp4.269.775
Rp4.824.846 total
includes taxes & fees
1 Oct - 2 Oct
Hotel & Spa Poco a Poco
View all properties
Save an average of 15% on thousands of hotels when you're signed in

Stay near popular Sierra attractions

Avancarí Nature Reserve

You can take time to visit Avancarí Nature Reserve during your travels to Sierra. While in this family-friendly area, you can enjoy the restaurants.
See properties

Café Monteverde Coffee Farm

Enjoy an outing to Café Monteverde Coffee Farm during your stay in Sierra. While in this family-friendly area, you can enjoy the restaurants.
See properties

Learn more about Sierra

Tucked between mountains and beaches, Sierra offers hiking trails with views of howler monkeys and tropical birds. Rent a surfboard at nearby Playa Hermosa or join a guided tour to Rincón de la Vieja's volcanic mud baths.

See all hotels in Sierra
A lush green mountain with dense forest and a cloudy sky.

Top Sierra Hotel Reviews

Camino Verde Bed & Breakfast

Camino Verde Bed & Breakfast

10/10 Excellent
"Jocelyn was amazing! She helped us plan and book our excursions. Simply the best! Diego was also extremely helpful and assisted us booking a park visit. Two better managers/trip advisors do not exist!"
Robert 2-night trip
Posted 2 hours ago
Camino Verde Bed & Breakfast
The Springs Resort and Spa at Arenal

The Springs Resort and Spa at Arenal

10/10 Excellent
"Property is expansive and immaculately maintained. In the off season it felt as if we had rented the entire beautiful property. Lots of walking and stairs — be warned. Everyone very eager to assist and please. Food is fine but unimaginative and ridiculously expensive. Cocktails are great, but still priced for NYC."
Timothy 3-night trip
Posted 5 hours ago
The Springs Resort and Spa at Arenal
Amalú Luxury View Cabins

Amalú Luxury View Cabins

10/10 Excellent
"The glass cabin 2.0 was amazing! The views from our cabin and the observation deck were absolutely unreal. We loved how clean everything was and it came equipped with all the utensils we could have possibly needed. Loved that there was an indoor and an outdoor hot tub for us to enjoy. The heated towel rack came in super handy to dry our bathing suits so that we didn’t have to pack wet soggy clothes in our luggage. I really felt like I was living in luxury, I highly recommend this place!"
My Ngoc 2-night trip
Posted 5 hours ago
Amalú Luxury View Cabins
Hotel Los Lagos Spa & Resort

Hotel Los Lagos Spa & Resort

8/10 Good
"Wonderful hot springs. Exceeded my expectations. And that view?? Unforgettable. Breakfast was FABULOUS. The only thing is that I could hear my neighbors pretty clearly and the excursions were pricyy (but I think still worth getting because they were easily accessible and so fun!). Overall, a great stay!"
Janelle 1-night trip
Posted 1 day ago
Hotel Los Lagos Spa & Resort
Hotel Lomas del Volcán

Hotel Lomas del Volcán

10/10 Excellent
"This place is a gem. Absolutely beautiful scenery and the staff were all so nice. They went out of their way to show us cool stuff around the area. Food was amazing as well"
Diego 3-night trip
Posted 1 day ago
Hotel Lomas del Volcán
Arenal Manoa & Hot Springs Resort

Arenal Manoa & Hot Springs Resort

10/10 Excellent
"Lush beautiful property, very friendly staff and clean comfortable rooms!"
Suzie 2-night trip
Posted 1 day ago
Arenal Manoa & Hot Springs Resort
Casa Luna Hotel & Spa

Casa Luna Hotel & Spa

10/10 Excellent
"Incredible place to stay at any time of the year"
Alexis 1-night trip
Posted 2 days ago
Casa Luna Hotel & Spa
Hotel Secreto La Fortuna

Hotel Secreto La Fortuna

10/10 Excellent
"Nice rooms in a quiet location but still close to everything. Very convenient, definitely recommendable."
Johanne Warberg 1-night trip
Posted 2 days ago
Hotel Secreto La Fortuna
Volcano Lodge Hotel & Thermal Experience

Volcano Lodge Hotel & Thermal Experience

10/10 Excellent
"Very nice place to stay, close to everything and amazing views"
Ernesto 3-night trip
Posted 5 days ago
Volcano Lodge Hotel & Thermal Experience

More cheap stays in Sierra

Viajero La Fortuna Hostel

Viajero La Fortuna Hostel

Av. 325 La Fortuna Provincia de Alajuela
Rp648.826
Rp733.173 total
1 Oct - 2 Oct
includes taxes & fees
Viajero La Fortuna Hostel
Arenal Xilopalo

Arenal Xilopalo

Calle 478 La Fortuna Alajuela
Rp1.019.353
Rp1.151.869 total
2 Oct - 3 Oct
includes taxes & fees
Arenal Xilopalo
Hotel Villas Vilma

Hotel Villas Vilma

3 Km West From Fortuna Central Park La Fortuna Alajuela
Rp1.638.155
Rp1.851.195 total
2 Oct - 3 Oct
includes taxes & fees
9.2/10 Wonderful! (126 reviews)
Hotel Villas Vilma
Tityra Lodge

Tityra Lodge

Ruta Nacional Treciaria 606 Monteverde Puntarenas
Rp1.909.084
Rp2.157.360 total
25 Oct - 26 Oct
includes taxes & fees
Tityra Lodge
BAUMA

BAUMA

Zeta Trece La Fortuna Provincia de Alajuela
Rp3.094.463
Rp3.496.743 total
1 Oct - 2 Oct
includes taxes & fees
9.8/10 Exceptional! (321 reviews)
BAUMA
Hostel La Choza Inn

Hostel La Choza Inn

Avenue 331 La Fortuna Alajuela
Get rates
7.8/10 Good! (232 reviews)
Hostel La Choza Inn

Find out more about Sierra

Top reasons to visit Sierra

  • Stunning Outdoor Activities: Sierra offers a variety of outdoor adventures amidst breathtaking landscapes, perfect for thrill-seekers.
  • Charming Neighbourhoods: Explore the delightful Albaicín neighbourhood, rich in Andalusian culture and artisan shops.
  • Luxurious Accommodations: Enjoy family-friendly hotels and charming bed and breakfasts equipped with modern amenities.
  • Vibrant Nightlife: Experience the lively nightlife in Sierra, offering a mix of entertainment and relaxation.
  • Cultural Exploration: Discover local flora and nature reserves, perfect for families and culture enthusiasts alike.

Find great hotels near Sierra

Explore a variety of lodging options in Sierra, Guanacaste, where family-friendly hotels and charming bed and breakfasts await. Whether you're seeking adventure, business facilities, or a relaxing vacation experience, you'll find accommodations equipped with air conditioning and convenient access. Enjoy the scenic beauty of the region while staying in comfortable establishments that cater to your every need.

  • Hotel & Spa Poco a Poco: Nestled a mere 11.3km from Sierra, Hotel & Spa Poco a Poco is a delightful 4-star retreat that offers an enchanting blend of adventure and relaxation. Ideal for families and thrill-seekers, this hotel boasts a variety of onsite and nearby activities, including horse riding, ziplining, and mountain biking. Children are well catered for with amenities such as a complimentary kids' club and a dedicated children's pool. For those seeking a moment of tranquillity, the full-service spa provides an array of indulgent treatments, including hot stone massages and aromatherapy, ensuring an unforgettable experience.
  • Cloud Forest Lodge: Located 12.9km from Sierra, Cloud Forest Lodge is a 3-star haven for nature enthusiasts and luxury seekers alike. Surrounded by lush vegetation and the breathtaking beauty of the Costa Rican landscape, this lodge offers a serene escape perfect for those looking to immerse themselves in nature. Guests can enjoy the tranquil atmosphere while indulging in well-appointed accommodations, all crafted to provide a restful retreat. The lodge’s commitment to environmental sustainability further enhances its appeal, making it a perfect choice for eco-conscious travellers seeking a luxury experience.
  • Koora Hotel by Sandglass: Just 12.9km from Sierra, Koora Hotel by Sandglass is a stylish 3.5-star property that welcomes all travellers, particularly those from the LGBTQIA community. Emphasising a nature-themed luxury experience, this hotel harmoniously blends comfort with an inviting atmosphere. Guests appreciate the focus on inclusivity and the well-designed rooms that enhance relaxation and enjoyment. With its affiliation to LGBTQI travel guides, Koora Hotel provides a safe and welcoming environment, making it a standout choice for those seeking both elegance and a sense of belonging during their stay in Costa Rica.

Where to stay near Sierra

Sierra, Guanacaste, offers a delightful blend of outdoor adventures and scenic beauty, perfect for a memorable vacation. Explore the charming Albaicín neighbourhood, where Andalusian culture meets artisan shops. Engage in altitude fun and discover beautiful locations that showcase the region's natural splendour. With a friendly atmosphere and family-friendly amenities, Sierra promises a warm and welcoming experience for all travellers seeking recreation and relaxation in a tropical paradise.

  • Monteverde: Nestled 12.9km from Sierra, Monteverde is a captivating city renowned for its breathtaking outdoor adventures and lush scenery. This destination draws visitors year-round, with peak travel occurring from January to March. Here, you can immerse yourself in a range of activities, from exhilarating adventures to soothing spa retreats. The nearby national parks offer an opportunity to explore diverse ecosystems, while the stunning volcanoes and beaches serve as perfect backdrops for your explorations. Whether you’re trekking through the cloud forests or relaxing at a local resort, Monteverde promises a memorable experience.
  • La Lindora: Located a mere 9.7km from Sierra, La Lindora is a charming village that attracts families and adventure seekers alike. This destination sees a steady flow of visitors, particularly in March and during the festive season from December to January. Take advantage of the vibrant shopping centre and nearby shopping areas for a delightful retail experience. La Lindora is also in proximity to beautiful nature reserves, tranquil lakes, and scenic beaches, making it ideal for outdoor activities. It’s a perfect spot to blend family fun with nature exploration.
  • Valle Bonito: Just 11.3km from Sierra, Valle Bonito offers a serene neighbourhood experience with a focus on eco-friendly adventures. Visitors are drawn here year-round, especially during the peak months of March and the festive season. This area is ideal for those seeking outdoor activities, with numerous hiking trails and adventure venues available. Valle Bonito is close to stunning nature reserves, national parks, and magnificent volcanoes, providing ample opportunities for exploration and connection with Costa Rica's rich biodiversity. It's a perfect destination for eco-conscious travellers looking to enjoy the great outdoors.

Things to do near Sierra

Sierra, located in Guanacaste, Costa Rica, is an ideal destination for outdoor enthusiasts and adventure seekers. Visitors can indulge in luxurious resorts and rejuvenating spas while exploring thrilling adventure activities amidst stunning scenery. The area also offers captivating attractions and vibrant nightlife, making it perfect for those looking to enjoy both day and night excursions. Experience the beauty and excitement that Sierra has to offer on your vacation.

Shopping

Experience the local charm in Sierra at nearby markets and shops. If you're up for a drive, visit El Pilon Station, located 48.3km away, offering a diverse range of gifts and souvenirs in a vibrant family-friendly atmosphere.

Recreation

At Wellness Park Costa Rica, indulge in serene relaxation activities amidst lush surroundings, perfect for rejuvenation. Termales Los Laureles offers soothing thermal waters and tranquil settings for ultimate relaxation. For adventure enthusiasts, Go Adventure Park provides exciting outdoor activities while maintaining a calming atmosphere, ideal for unwinding after an adrenaline rush.

Adventure

Cerró Pelado offers an exhilarating hiking experience with stunning scenery, located 12.9km from Sierra. Ficus La Raiz is perfect for outdoor enthusiasts, situated 11.3km away, providing an immersive nature experience. For thrilling activities, 100% Aventura Adventure Park, 12.9km from Sierra, promises adventure-filled excitement.

Nightlife

Experience the vibrant nightlife in Sierra by visiting the La Vida Loca bar for refreshing cocktails and a lively atmosphere. For a more laid-back evening, head to the nearby El Cangrejo Restaurant, where you can enjoy local cuisine while listening to soothing live music.

*Distances are measured in a straight line; actual driving distances may vary depending on the route.

Booking tips and Expedia advantages for Sierra

To save money during your visit to Sierra, Guanacaste, consider travelling in the off-peak months of May and September to October, when accommodation prices are lower. Utilise public transport options like buses or bicycles to cut travel costs. Enjoy free entry activities such as Curi-Cancha Reserve. For the best hotel deals, book around a month in advance or explore last-minute offers on Expedia. Saturday tends to be the cheapest day to stay, so plan accordingly. Additionally, consider package deals that combine flights, hotels, and activities for further savings.

  • The most and least expensive months on average to stay in a hotel: The cheapest months to stay in Sierra are May and September to October, where the prices are slightly lower. This is in comparison to March to April and July, where prices are slightly higher.
  • The best time to book a hotel: Booking a hotel in Sierra about 1 month out from when you are planning to stay is usually when prices are lowest. If you're a little more spontaneous, you could also peruse Expedia's last minute deals for hotels, look out for the green banner below the price, as this indicates a cheaper deal.
  • The most and least expensive days on average to stay in a hotel: The least expensive day to stay in Sierra is Saturday. The most expensive day to stay in Sierra is Thursday.
  • Find cheap hotels on Expedia: Expedia's search tool enables you to specify your budget, chosen location, and additional preferences. You can arrange your results to display prices from the lowest to the highest, ensuring you spot the most affordable hotels right away. Furthermore, you can refine your choices by hotel type; for instance, by selecting the Eco-certified filter, you'll discover a selection of sustainable and environmentally-friendly accommodations available for booking.
  • Consider bundling your trip: You can save money by combining your hotel reservations in Sierra with your flights and activities by opting for an Expedia package.

Find the best attractions near Sierra

Sierra in Guanacaste, Costa Rica, offers an ideal setting for outdoor and adventure enthusiasts, surrounded by stunning scenery. Visitors can explore various points of interest, including reserves, flower gardens, and private gardens, making it perfect for families and culture seekers alike. Whether you're hiking through natural preserves or enjoying the vibrant flora, Sierra promises a memorable experience for all who seek a taste of its beauty.

  • Monteverde Cloud Forest Biological Reserve: A breathtaking natural wonder, this reserve boasts lush vegetation, diverse wildlife, and misty trails. Experience the enchanting sounds of the forest and perhaps spot a resplendent quetzal.
  • Ecomuseo de las Minas de Abangares: Immerse yourself in local culture and history at this fascinating museum. Explore exhibits that celebrate the region's mining heritage while enjoying the unique vibe of traditional Costa Rican life.
  • Monteverde Butterfly Gardens: A tranquil haven, this private garden showcases a myriad of vibrant butterfly species. Wander through beautifully maintained paths and witness the delicate beauty of nature up close.

Best time to go to Sierra

The best time to visit Sierra can depend on the weather and when visitor numbers rise and fall. The hottest average temperature in Sierra falls in April, when visitor numbers are average and weather is mostly sunny with light rain. The coolest average temperature in Sierra falls in November, visitor numbers are average and weather is mostly cloudy with moderate rain.

calendarCalendar MonthtemperatureTemperaturerainPrecipitationmostlyCloudinessoccupationOccupancypricePricing
January79.2°F (26.2°C)No RainSunnySlightly HighAverage
February80.6°F (27.0°C)No RainSunnyAverageAverage
March81.9°F (27.7°C)No RainSunnySlightly HighSlightly High
April82.2°F (27.9°C)Light RainMostly SunnyAverageSlightly High
May81.3°F (27.4°C)Frequent RainMostly CloudySlightly LowSlightly Low
June79.9°F (26.6°C)Frequent RainMostly CloudyAverageAverage
July79.5°F (26.4°C)Frequent RainMostly CloudyAverageSlightly High
August79.5°F (26.4°C)Frequent RainMostly CloudyAverageAverage
September79.3°F (26.3°C)Frequent RainMostly CloudySlightly LowSlightly Low
October78.6°F (25.9°C)Frequent RainMostly CloudySlightly LowSlightly Low
November78.3°F (25.7°C)Moderate RainMostly CloudyAverageAverage
December78.4°F (25.8°C)Light RainMostly SunnySlightly HighAverage

The nearest major airports for your trip to Sierra

To reach Sierra, Guanacaste, Costa Rica, you have several airport options. San José (SJO - Juan Santamaría Intl.) is situated 85.3km away, with nearby hotels like the 4.5-star Hilton San Jose La Sabana, 12.9km from the airport, offering various transportation services. Liberia (LIR - Daniel Oduber Intl.) is 75.6km from Sierra, with excellent accommodation options such as Villas Hermosa Heights, located 16.1km away, providing shuttle services. Closer still is Cóbano Airport (ACO), just 69.2km from Sierra, with hotels like Anamaya and Ylang Ylang Beach Resort, both 4.8km from the airport, ensuring easy access for your travels.

Frequently asked questions

What's the best place to stay in Sierra?
Based on our traveller data, Amalú Luxury View Cabins is one of the top choices for your stay. This lodge offers free parking and private balconies. Other good options for your visit to the area are Tabacón Thermal Resort & Spa and Hotel Los Lagos Spa & Resort. See all available top hotels, or vacation rentals in Sierra.
What are some of the best holiday rentals that Sierra has to offer?
Green Forest Vacations Homes: This holiday home rental outside of Sierra offers an indoor pool, a balcony and free WiFi to help you feel perfectly comfortable in your new surroundings. Kitchen amenities include a stovetop, a microwave and a coffee maker. Make the most of garden in this rental home to help you unwind. See all vacation rentals in Sierra.
If I need to cancel my hotel reservation in Sierra, will I receive a refund?
Yes, you'll find most hotel reservations are fully refundable if you cancel prior to the accommodation's cancellation deadline, which is usually within 24-48 hours of your check-in date. If you booked a non-refundable reservation, it may still be possible to cancel it and receive a refund within a 24-hour period of your booking. Filter your search by fully refundable to find flexible hotel deals in Sierra.
What's the best budget-friendly accommodation in Sierra?
Based on our traveller reviews, Sofi's Hostel Monteverde is a top choice for a less expensive stay. View all budget hotels in Sierra.
What's the best dog-friendly hotel in Sierra?
Cabañas Don Camilo Lodge is a top lodge for people travelling with their pets and offers in-room balconies for its human guests. See more pet-friendly hotel accommodations in Sierra.
What's the best high-end place to stay in Sierra?
Amalú Luxury View Cabins is a luxury lodge with in-room kitchens, and a popular choice for Expedia travellers looking for an elegant place to stay. Find more luxury hotels in Sierra.
What are some accommodation options with pools in Sierra?
Tabacón Thermal Resort & Spa: Resort, 7-minute walk from Arenal Volcano National Park. Offers a children's pool, an outdoor pool and 2 restaurants. Hotel Los Lagos Spa & Resort and The Springs Resort and Spa at Arenal are two additional hotels with an on-site pool. View all hotels with pools in Sierra.
What's it like staying in Sierra?
Visitors to Sierra will definitely enjoy the restaurants. Tourists can also enjoy the city's local tours and coffee shops. A top sight in the area is Arenal Volcano National Park. In Sierra, there are 31 hotels and other accommodation options to choose from. Find out more about Sierra.
What should I do while I'm visiting Sierra?
A couple of favourite places to visit are Café Monteverde Coffee Farm and Avancarí Nature Reserve. Additionally, you'll find Arenal Volcano National Park in the area. Take a look at what more there is to see and do in Expedia's Sierra guide.
What's the seasonal weather in Sierra?
The hottest months are usually March and February, with an average temperature of 27°C, while the coldest months are January and December, with an average of 26°C. The rainiest months in Sierra are October, August, June and September, with each month seeing an average of 482 mm of rainfall.