Taking into account the local weather in El Rosal is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually September and August with an average temp of 62°F, while the coldest months are January and December with an average of 61°F. The rainiest months in El Rosal are March, November, April, and October, with each month seeing an average of 12 inches of rainfall.