Chicago Weather Shock: Severe Storms and Flash Flooding Threaten the City—Here’s Your Hour-by-Hour Forecast

Chicago is waking up to a soggy Thursday as a slow-moving autumn front drenches the metro area. Morning temperatures hover near 73°F (23°C) with 99 % rain coverage, tapering to scattered showers by midday and breezy northerly winds around 11 mph. The soggy start ushers in a five-day cooldown that will make the city feel more like late September than mid-month. Short-Term Forecast • Thursday: Heavy rain through late morning, then isolated drizzle; daytime high 73°F, evening low 68°F. Gusts up to 15 mph may reduce visibility on Lake Shore Drive. • Friday: Lingering clouds, spotty showers before dawn; cooler with a high near 70°F and a crisp low of 64°F. • Weekend: On-and-off showers Saturday (high 70°F), turning overcast and breezy Sunday as highs dip to the mid-60s. • Early next week: Dry spell but noticeably cooler—daytime temps stall in the low 60s with nights in the upper 50s, nearly ten degrees below average for mid-September. What’s Driving the Shift Meteorologists credit a Canadian high-pressure system pushing southward and locking moisture over the Great Lakes. As it settles, winds swing northeast, pulling cooler air off Lake Michigan and shaving several degrees from the city’s normal 75°F/56°F September averages. Impacts & Safety Tips • Commuters: Expect ponding on the Eisenhower and Kennedy; allow extra braking distance. • Air travelers: O’Hare and Midway could face delays through mid-morning Thursday while visibility improves. • Outdoor events: Friday night football should dodge downpours, but pack layers—temperatures fall quickly after sunset. • Boaters: Elevated north winds Friday–Sunday may trigger Small Craft Advisories; check the latest marine warnings. Looking Ahead Model guidance hints at a brief rebound late next week with highs nudging back into the upper 60s, but long-range outlooks keep the broader pattern cool and unsettled through the end of the month. For Chicagoans, that means sweater weather is here to stay—at least for now.