If you planning to travel to Mercer Slough Nature Park, Bellevue, 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 3:04 PM. The temperature feels like 52.2 with a humidity level of 87 so dress accordingly. Cloud coverage is 91 percent with visibility at 10.4 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 6 MPH. At the end of the day don’t miss the sunset at 12:38 AM.