Planning for the weather is a good way to make your trip to San Marcos La Laguna relaxing and enjoyable, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 16°C, while the coldest months are January and December, with an average of 16°C. The rainiest months in San Marcos La Laguna are June, September, May and August, with each month seeing an average of 472 mm of rainfall.