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 Kennebunk: The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of -1°C. The snowiest months in Kennebunk are January, March, February and November, with each month seeing an average of 21 cm of snowfall.