Planning for the weather is a good way to make your trip to Bonnyville relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August with an average temp of 59°F, while the coldest months are February and January with an average of 12°F. The snowiest months in Bonnyville are February, April, January, and March, with each month seeing an average of 17 inches of snowfall.