Taking into account the local weather in Merida is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually May and April with an average temp of 82°F, while the coldest months are February and January with an average of 80°F. The rainiest months in Merida are July, June, September, and October, with each month seeing an average of 12 inches of rainfall.