Weather in the Islands

Washington State Tourist Information and Travel Guide

The weather on the San Juan Islands and the islands to the south is often wet and cool during the winter months and warm and sunny in the summertime.

Average daily temperatures at Friday Harbor on San Juan Island are as follows:

Month Minimum Maximum Precipitation
Jan 36 47 3.9
April 41 58 2.3
July 51 71 0.8
Oct 44 59 2.3


Weather in the San Juan Islands of Washington State
Weather in the Islands, Washington State

It is not uncommon to have fog over the islands in the mornings.  It normally burns off by 10:00 AM.

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