Weather is probably a major factor when you plan your trip to Santa Rosa Copan, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May with an average temp of 70°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Santa Rosa Copan are September, June, August, and October, with each month seeing an average of 12 inches of rainfall.