Planning for the weather is an important factor for making your trip to Copan Ruinas a success, especially when you’re splurging. 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 Copan Ruinas are September, June, August, and October, with each month seeing an average of 12 inches of rainfall.