Planning for the weather is a good way to make your trip to Amahai relaxing and enjoyable, especially when you're splurging. The hottest months are usually January and December, with an average temperature of 27°C, while the coldest months are August and September, with an average of 25°C. The rainiest months in Amahai are March, May, July and April, with each month seeing an average of 346 mm of rainfall.