Planning for the weather is a good way to make your trip to Roatan relaxing and enjoyable, especially when you’re splurging. 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.