articleThe Brief The Wisconsin State Fair starts on Thursday, Aug. 6. A look back at the history and weather during the Wisconsin State Fair. As summer winds to a close, heading to the Wisconsin State Fair is a cherished annual tradition for many. (Credit: Lisa Michaels)Past opening day weatherBy the numbers:The normal high temperature at the end of July into early August is 82°F, but opening day temperatures have ranged from the low 70s like last year to the low 100s. 2026 State Fair hoursWhat we know:If you want to attend the Wisconsin State Fair, it goes from Aug. 6–16.