San Juan Island Swimming
The beaches around the Island, while beautiful to look at and hike, are not conducive to swimming unless you are scuba diving and have proper thermal gear. The water temperature is about 50 degrees year round.
The Island does have several options for swimming in indoor/outdoor pools:
San Juan Island Parks & Recreation Information 580 Guard St
Friday Harbor, WA 98250

(360) 378-4953Adult, teen and youth programs – swimming, yoga lessons, volleyball & softball leagues, soccer, baseball/tennis camps, & nature programs.
San Juan Athletic & Fitness Club 435 Argyle St.
Friday Harbor , WA 98250

(360) 378-4449Full fitness facility with 8 lane indoor pool. Day memberships available.
Roche Harbor PO Box 4001
Roche Harbor, WA 98250
2 outdoor pools and kiddie pool.  Seasonal hours. Day memberships available.