If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in North Bonneville: The hottest months are usually August and July with an average temp of 63°F, while the coldest months are December and January with an average of 36°F. The rainiest months in North Bonneville are December, November, January, and February, with each month seeing an average of 12 inches of rainfall.