Other facts from our historical weather data: Which is the warmest month in Mount Pleasant? January has an average maximum temperature of 15°C (59°F) and is the warmest month of the year. Which is the coldest month in Mount Pleasant? The coldest month is July with an average maximum temperature of 6°C (43°F). Which is the wettest month in Mount Pleasant? December tops the wettest month list with 79mm (3.1 in) of rainfall. Which is the driest month in Mount Pleasant? August is the driest month with 41mm (1.6 in) of precipitation. Which is the sunniest month in Mount Pleasant? November is the sunniest month with an average of 200 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.