Taking into account the local weather in Grins 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 50°F, while the coldest months are January and February with an average of 21°F. The snowiest months in Grins are April, May, November, and January, with each month seeing an average of 5 inches of snowfall.