Weather is probably a major factor when you plan your trip to Polson, but bear in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually July and August, with an average temperature of 17°C, while the coldest months are February and January, with an average of -3°C. The snowiest months in Polson are January, December, February and March, with each month seeing an average of 26 cm of snowfall.