Other facts from our historical weather data: Does Mérida have a dry season? Yes, the months of February and March are very dry. Which is the hottest month in Mérida? May has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in Mérida? The coolest month is January with an average maximum temperature of 30°C (86°F). Which is the wettest month in Mérida? September tops the wettest month list with 146mm (5.7 in) of rainfall. Which is the driest month in Mérida? March is the driest month with 15mm (0.6 in) of precipitation. Which is the sunniest month in Mérida? May is the sunniest month with an average of 275 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.