If you planning to travel to Riverside State Park, Spokane, 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 1:44 PM. The temperature feels like 33.9 with a humidity level of 62 so dress accordingly. Cloud coverage is 87 percent with visibility at 11 percent. Today’s UV index is 3, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 9 MPH. At the end of the day don’t miss the sunset at 2:08 AM.