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September 2026 Climate Summary

Hazardous Weather Conditions

Current conditions at

Chicago / West Chicago, Dupage Airport (KDPA)

Lat: 41.9°NLon: 88.25°WElev: 758ft.

Rain Fog/Mist

69°F

21°C

Humidity	96%
Wind Speed	SW 13 G 20 mph
Barometer	29.87 in (1011.7 mb)
Dewpoint	68°F (20°C)
Visibility	4.00 mi
Last update	1 Oct 1:52 pm CDT

More Information:

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

Extended Forecast for

Saint Charles IL

Flood Watch October 1, 02:45pm until October 1, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch October 1, 02:45pm until October 1, 10:00pm
NOW until 10:00pm Thu
Flood Watch
This Afternoon
High: 71 °F
Rain
Tonight
Low: 51 °F
Rain then
Slight Chance
Rain
Friday
High: 64 °F
Becoming
Sunny
Friday Night
Low: 44 °F
Mostly Clear
Saturday
High: 66 °F
Sunny
Saturday Night
Low: 46 °F
Mostly Clear
Sunday
High: 70 °F
Sunny
Sunday Night
Low: 44 °F
Mostly Clear

Detailed Forecast

This Afternoon

Rain and possibly a thunderstorm. High near 71. West southwest wind around 10 mph becoming north northwest. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Tonight

Rain, mainly before 10pm. Low around 51. North wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Mostly cloudy through mid morning, then gradual clearing, with a high near 64. North wind around 10 mph, with gusts as high as 20 mph.

Friday Night

Mostly clear, with a low around 44. Northeast wind around 5 mph becoming calm in the evening.

Saturday

Sunny, with a high near 66. Calm wind becoming east southeast around 5 mph in the morning. Winds could gust as high as 10 mph.

Saturday Night

Mostly clear, with a low around 46.

Sunday

Sunny, with a high near 70.

Sunday Night

Mostly clear, with a low around 44.