Other facts from our historical weather data: When is the rainy season in San Miguel? Rainy season in San Miguel occurs in the months of May, June, July, August, September and October. Does San Miguel have a dry season? Yes, the months of January, February, March and December are very dry. Which is the hottest month in San Miguel? March has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in San Miguel? The coolest month is December with an average maximum temperature of 32°C (90°F). Which is the wettest month in San Miguel? September tops the wettest month list with 347mm (13.7 in) of rainfall. Which is the driest month in San Miguel? January is the driest month with 2mm (0.1 in) of precipitation. 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.