Chicago, IL – Summerlike warmth will linger across northern Illinois through the end of the workweek, with showers and storms possible over the weekend.
The US National Weather Service in Chicago says highs will climb between 85 and 90 degrees on Thursday, September 18, with slightly cooler readings near Lake Michigan. Warm conditions will persist Friday, bringing inland highs in the upper 80s to near 90, while lakeside communities stay in the 70s.
Rain chances will increase late Friday along the I-39 corridor, with scattered showers and thunderstorms possible Saturday and Sunday afternoons. The Weather Service notes rain coverage will remain limited at 20–30%, so the weekend won’t be a washout — but outdoor plans may face brief interruptions.
Saturday’s highs will range from 82 to 87 degrees, and Sunday will stay warm with highs between 81 and 85. Overnight lows through the weekend will sit in the low to mid-60s.
Forecasters add that winds off Lake Michigan will keep conditions noticeably cooler along the shoreline through Saturday. Residents planning outdoor activities should keep umbrellas handy as isolated showers and storms could develop, especially in the afternoons.
Commuters and eventgoers across Chicago, Cook County, and the wider northern Illinois region are urged to monitor local forecasts for the latest storm timing.
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