Weather of Lake Atitlan
 
It is a pleasant tropical climate with two main seasons: the dry season from November to May is very warm and very little rain between December and March, while the rainy season from mid-May to mid-October has heavy rain, especially in September.

In the rainy season the days can be cold, and as Lake Atitlán is upland, nights can be cold throughout the year. There is also a windy season between November and February, when the boat trips are not very suitable.