National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

38°F

3°C

Humidity 97%
Wind Speed Calm
Barometer 30.09 in (1019.0 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 10 Jan 2:53 am CST
Extended Forecast for

3 Miles SSE Mascoutah IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 39. Light north wind.

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 48. Light northwest wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 25 mph.

    High: 48 °F

    Chance Rain
    then Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 25. West wind 7 to 15 mph, with gusts as high as 26 mph.

    Low: 25 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 39. Northwest wind 5 to 15 mph, with gusts as high as 24 mph.

    High: 39 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 25. Calm wind becoming southwest around 6 mph after midnight.

    Low: 25 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 39. Light north wind.
Saturday
A 30 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 48. Light northwest wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 25 mph.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 25. West wind 7 to 15 mph, with gusts as high as 26 mph.
Sunday
Sunny, with a high near 39. Northwest wind 5 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 25. Calm wind becoming southwest around 6 mph after midnight.
Monday
Sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Partly sunny, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 22.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 45.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Mascoutah IL
 38.47°N 89.78°W (Elev. 420 ft)
Last Update:
3:16 am CST Jan 10, 2026
Forecast Valid:
3am CST Jan 10, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation