Taking into account the local weather in Topsham is an important factor for planning your visit, especially if you plan to spend your trip poolside. 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 22°F. The snowiest months in Topsham are January, March, February, and April, with each month seeing an average of 12 inches of snowfall.