Taking into account the local weather in Brenna 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 63°F, while the coldest months are January and February with an average of 32°F. The snowiest months in Brenna are December, November, January, and February, with each month seeing an average of 9 inches of snowfall.