If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Shediac: The hottest months are usually July and August with an average temp of 63°F, while the coldest months are January and February with an average of 24°F. The snowiest months in Shediac are January, February, March, and December, with each month seeing an average of 14 inches of snowfall.