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 2:33 PM. The temperature feels like 46 with a humidity level of 80 so dress accordingly. Cloud coverage is 90 percent with visibility at 9.4 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 10 MPH. At the end of the day don’t miss the sunset at 2:07 AM.