The weather in Bellingham in late June is generally pleasant.

According to Weather Underground:

Historical Summary for June 25 – June 30

The Average High Temperature is 70 F with a historical range of 59 F to 88 F
The Average Low Temperature is 52 F with a historical range of 43 F to 61 F
The Average Daily Precipitation is 0.05 inches, with a historical range of 0.00 to 0.64 inches. There is a 31% chance of a Precipitation Day.
The Average Wind is 6 mph with a historical range of 0 mph to 15 mph