If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Mount Pleasant: The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and February, with an average of 1°C. The snowiest months in Mount Pleasant are January, February, December and November, with each month seeing an average of 17 cm of snowfall.