Other facts from our historical weather data: Which is the hottest month in Mount Pleasant? August has an average maximum temperature of 31°C (88°F) and is the hottest month of the year. Which is the coolest month in Mount Pleasant? The coolest month is February with an average maximum temperature of 28°C (82°F). Which is the wettest month in Mount Pleasant? October tops the wettest month list with 157mm (6.2 in) of rainfall. Which is the driest month in Mount Pleasant? February is the driest month with 58mm (2.3 in) of precipitation. Which is the sunniest month in Mount Pleasant? July is the sunniest month with an average of 264 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.