Highest temperature in Chicago on September 12? - 83 or below

Prediction market on polymarket_us. Will the highest temperature recorded at Chicago Midway Airport (KMDW) in Chicago for 2026-09-12 as reported by the National Weather Service's Climatological Report (Daily) be less than or equal to 83F? Outcome verified from NWS Climatological Report.

Resolves: 9/13/2026.