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September 2025 Climate Summary

Current conditions at

Chicago, Chicago Midway Airport (KMDW)

Lat: 41.78°NLon: 87.76°WElev: 617ft.

Fair

79°F

26°C

Humidity	32%
Wind Speed	S 9 mph
Barometer	30.03 in (1016.1 mb)
Dewpoint	47°F (8°C)
Visibility	10.00 mi
Heat Index	79°F (26°C)
Last update	5 Oct 7:53 pm CDT

More Information:

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

Extended Forecast for

Merrionette Park IL

Tonight
Low: 68 °F
Mostly Clear
Monday
High: 86 °F
Sunny then
Chance
T-storms
Monday Night
Low: 60 °F
Showers
Tuesday
High: 66 °F
Chance
Showers
Tuesday Night
Low: 52 °F
Mostly Clear
Wednesday
High: 65 °F
Sunny
Wednesday Night
Low: 47 °F
Clear
Thursday
High: 65 °F
Sunny
Thursday Night
Low: 49 °F
Mostly Clear

Detailed Forecast

Tonight

Mostly clear, with a low around 68. South wind around 10 mph.

Monday

A 40 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 86. Southwest wind around 10 mph, with gusts as high as 15 mph.

Monday Night

A chance of showers and thunderstorms before 7pm, then showers and possibly a thunderstorm between 7pm and 4am, then showers after 4am. Low around 60. West wind around 5 mph becoming north after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Tuesday

A 40 percent chance of showers, mainly before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 66. North wind 10 to 15 mph, with gusts as high as 20 mph.

Tuesday Night

Mostly clear, with a low around 52. North wind 5 to 10 mph.

Wednesday

Sunny, with a high near 65.

Wednesday Night

Clear, with a low around 47.

Thursday

Sunny, with a high near 65.

Thursday Night

Mostly clear, with a low around 49.

Friday

Mostly sunny, with a high near 69.