If you planning to travel to Milepost 31 Museum, Seattle, 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 1:07 PM. The temperature feels like 68.44999999999999 with a humidity level of 69 so dress accordingly. Cloud coverage is 6 percent with visibility at 15.3 percent. Today’s UV index is 8, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 5 MPH. At the end of the day don’t miss the sunset at 3:20 AM.