If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Nanoose Bay: The hottest months are usually July and August with an average temp of 62°F, while the coldest months are February and December with an average of 40°F. The rainiest months in Nanoose Bay are November, January, December, and October, with each month seeing an average of 10 inches of rainfall.