Weather is probably a major factor when you plan your trip to Chaitén, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 55°F, while the coldest months are July and August with an average of 42°F. The rainiest months in Chaitén are August, June, May, and July, with each month seeing an average of 24 inches of rainfall.