Taking into account the local weather in Roatan 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 83°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Roatan are November, October, December, and January, with each month seeing an average of 11 inches of rainfall.