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 3:28 PM. The temperature feels like 42.8 with a humidity level of 72 so dress accordingly. Cloud coverage is 67 percent with visibility at 12.8 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 20 MPH. At the end of the day don’t miss the sunset at 12:27 AM.