If you planning to travel to Six Flags Great America, Gurnee, 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 1:02 PM. The temperature feels like 33.95 with a humidity level of 60 so dress accordingly. Cloud coverage is 67 percent with visibility at 18.7 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 16 MPH. At the end of the day don’t miss the sunset at 10:19 PM.