(GMT)14 JAN 2017 9394IT:
Trick question "How many San Juan islands are there?;
It depends on the tide. There are around 176 islands and reefs in the San Juan island chain but as many as 743 peek above the water line at low tide.
Count on temperatures around 70° in the summer and 40° in the winter. A happy confluence of weather systems also accounts for the high level of air quality you’ll appreciate across the San Juans.
The four ferry served Islands; San Juan Island (with the county seat Friday Harbor), Orcas Island, Lopez Island and Shaw Island are the most populous and host the vast majority of lodging and dining options and tourism activities.
Just a few dozen San Juan islands are inhabited.