If you planning to travel to San Juan Island National Historic Park, Friday Harbor, Washington, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 3:00 PM. The temperature feels like 49.65 with a humidity level of 84 so dress accordingly. Cloud coverage is 83 percent with visibility at 8.5 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 5 MPH. At the end of the day don’t miss the sunset at 12:50 AM.