Taking into account the local weather in Maple Grove 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 56°F, while the coldest months are February and December with an average of 36°F. The rainiest months in Maple Grove are November, January, December, and March, with each month seeing an average of 10 inches of rainfall.