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Dupo, Illinois Weather Forecast
Dupo, Illinois Weather
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Weather Forecast for Dupo, Illinois : St. Clair County
Issued: 3:16 am CST Dec 7, 2025 Latitude: 38.5161634 Longitude: -90.2103903 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
20% chance of  on Overnight 20% chance of  on Sunday Mostly Cloudy on Monday Mostly Sunny on Tuesday Partly Sunny on Wednesday 30% chance of rain & snow on Thursday Mostly Sunny on Friday Partly Sunny on Saturday
Low: 37°F High: 42°F High: 35°F High: 54°F High: 50°F High: 39°F High: 27°F High: 23°F
Low: 23°F Low: 27°F Low: 42°F Low: 28°F Low: 18°F Low: 7°F  
Cloudy Cloudy Mostly Cloudy Mostly Sunny Partly Sunny Rain & Snow Mostly Sunny Partly Sunny
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Current Conditions at
EAST ST LOUIS - (KCPS)
39°
Cloudy
as of 4:22 AM CST
Rel. Humidity: 86%
Dew Point: 36°F
Visibility: 8 Miles
Pressure: 29.93 in.
Flight Rule: MVFR
Wind Data
3 MPH
160° South
Cloud Level(s): Solid Overcast at 1400ft
Current Conditions at
ST LOUIS - (KSTL)
37°
Cloudy
as of 3:51 AM CST
Rel. Humidity: 86%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: MVFR
Wind Data
5 MPH
170° South
Cloud Level(s): Solid Overcast at 1500ft
Current Conditions at
SCOTT AFB - (KBLV)
39°
Feels like 33°F
Cloudy
Mist
as of 3:55 AM CST
Rel. Humidity: 93%
Dew Point: 37°F
Visibility: 5 Miles
Pressure: 29.93 in.
Flight Rule: IFR
Wind Data
9 MPH
210° Southwest
Cloud Level(s): Solid Overcast at 800ft
Current Conditions at
SPIRIT OF ST LOUIS - (KSUS)
37°
Partly Cloudy
as of 3:54 AM CST
Rel. Humidity: 86%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.91 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 5000ft, Scattered at 12000ft
20% chance of  Overnight Overnight... A chance of sprinkles after 5am. Cloudy, with a low around 37. South wind around 5 mph.

20% chance of  Sunday Sunday... A chance of sprinkles before 11am. Cloudy, with a high near 42. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 21 mph.

Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 23. North wind 7 to 11 mph, with gusts as high as 20 mph.

Mostly Cloudy on Monday Monday... Mostly cloudy, then gradually becoming sunny, with a high near 35. North wind around 5 mph becoming calm in the morning.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 27. Calm wind becoming south 5 to 9 mph in the evening.

Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 54.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 42.

Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 50.

20% chance of rain & snow Wednesday Night Wednesday Night... A slight chance of rain and snow after midnight. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.

30% chance of rain & snow Thursday Thursday... A chance of rain and snow before noon, then a slight chance of rain. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.

20% chance of rain & snow Thursday Night Thursday Night... A slight chance of rain and snow. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.

Mostly Sunny on Friday Friday... Mostly sunny, with a high near 27.

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 7.

Partly Sunny on Saturday Saturday... Partly sunny, with a high near 23.

Current Radar Image


Sun Almanac for Dupo, Illinois
Sunrise: 07:05 AM
Sunset: 4:40 PM
Civil Sunrise:06:36 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:03 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:31 AM
Astro Sunset: 6:14 PM
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