Taking into account the local weather in Grimsland is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 57°F, while the coldest months are February and January with an average of 37°F. The snowiest months in Grimsland are January, February, December, and March, with each month seeing an average of 7 inches of snowfall.