Other facts from our historical weather data: Which is the hottest month in Matam? May has an average maximum temperature of 43°C (109°F) and is the hottest month of the year. Which is the coolest month in Matam? The coolest month is January with an average maximum temperature of 34°C (93°F). Which is the wettest month in Matam? August tops the wettest month list with 100mm (3.9 in) of rainfall. Which is the driest month in Matam? April is the driest month with 0mm (0 in) of precipitation. Which is the sunniest month in Matam? May is the sunniest month with an average of 298 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.