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September 2026 Climate Summary

Hazardous Weather Conditions

Current conditions at

Chicago, Chicago Midway Airport (KMDW)

Lat: 41.78°NLon: 87.76°WElev: 617ft.

Light Rain Fog/Mist

71°F

22°C

Humidity	87%
Wind Speed	W 10 mph
Barometer	29.88 in (1011.1 mb)
Dewpoint	67°F (19°C)
Visibility	6.00 mi
Last update	1 Oct 12:53 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Chicago IL

Flood Watch until October 1, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch until October 1, 10:00pm
NOW until 10:00pm Thu
Flood Watch
This Afternoon
High: 72 °F
Heavy Rain
Tonight
Low: 57 °F
Heavy Rain
then Chance
Rain
Friday
High: 61 °F
Becoming
Sunny
Friday Night
Low: 51 °F
Mostly Clear
Saturday
High: 63 °F
Sunny
Saturday Night
Low: 49 °F
Mostly Clear
Sunday
High: 68 °F
Sunny
Sunday Night
Low: 51 °F
Mostly Clear

Detailed Forecast

This Afternoon

Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 72. West southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Tonight

Rain, mainly before 11pm. The rain could be heavy at times. Low around 57. North wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

Friday

Mostly cloudy through mid morning, then gradual clearing, with a high near 61. North wind 10 to 15 mph, with gusts as high as 20 mph.

Friday Night

Mostly clear, with a low around 51. North northeast wind 5 to 10 mph.

Saturday

Sunny, with a high near 63. East southeast wind around 5 mph, with gusts as high as 10 mph.

Saturday Night

Mostly clear, with a low around 49.

Sunday

Sunny, with a high near 68.

Sunday Night

Mostly clear, with a low around 51.