If you planning to travel to Weldon Springs State Park, Illinois, 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 12:47 PM. The temperature feels like 37.85 with a humidity level of 66 so dress accordingly. Cloud coverage is 57 percent with visibility at 13 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 18 MPH. At the end of the day don’t miss the sunset at 10:35 PM.