If you planning to travel to Onstad Park, Westby, Montana, 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 2:45 PM. The temperature feels like -9.5 with a humidity level of 85 so dress accordingly. Cloud coverage is 73 percent with visibility at 8.6 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southeast at a speed of 14 MPH. At the end of the day don’t miss the sunset at 11:00 PM.