If you planning to travel to Jefferson County Fairgrounds, Jefferson, Wisconsin, 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 11:35 AM. The temperature feels like 43.5 with a humidity level of 87 so dress accordingly. Cloud coverage is 87 percent with visibility at 5 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 15 MPH. At the end of the day don’t miss the sunset at 12:23 AM.