I was in this area in September this year and can tell you that it was generally quite mild throughout the trip. It was cooler in the Rockies (we had a flurry of snow but I hadn't taken a scarf or gloves and was fine) but it was in the mid-20s when we were in Vancouver. In June, the averages are just a few degrees higher.

Kindest regards,

Julia

All the best,

Bob