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

22°F

-6°C

Humidity 55%
Wind Speed N 15 mph
Barometer 30.12 in (1020.2 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 15 Jan 1:53 am CST
Extended Forecast for

Mascoutah IL

  • Overnight

    Overnight: Clear, with a low around 17. Northwest wind around 8 mph.

    Low: 17 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 34. Northwest wind 5 to 7 mph becoming south in the afternoon.

    High: 34 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of snow between 9pm and 1am. Mostly cloudy, with a low around 27. Light south wind increasing to 5 to 10 mph in the evening. Chance of precipitation is 20%.

    Low: 27 °F

    Slight Chance
    Snow

  • Friday

    Friday: Mostly cloudy, with a high near 44. West wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 44 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A chance of sprinkles before 8pm, then a chance of flurries between 8pm and midnight, then a slight chance of snow showers after midnight. Mostly cloudy, with a low around 22. West wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    Low: 22 °F

    Chance
    Sprinkles/Flurries
    then Slight
    Chance Snow
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 27.

    High: 27 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 17. Northwest wind around 8 mph.
Thursday
Sunny, with a high near 34. Northwest wind 5 to 7 mph becoming south in the afternoon.
Thursday Night
A slight chance of snow between 9pm and 1am. Mostly cloudy, with a low around 27. Light south wind increasing to 5 to 10 mph in the evening. Chance of precipitation is 20%.
Friday
Mostly cloudy, with a high near 44. West wind 10 to 17 mph, with gusts as high as 25 mph.
Friday Night
A chance of sprinkles before 8pm, then a chance of flurries between 8pm and midnight, then a slight chance of snow showers after midnight. Mostly cloudy, with a low around 22. West wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Saturday
Partly sunny, with a high near 27.
Saturday Night
Partly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 25.
Sunday Night
Partly cloudy, with a low around 15.
M.L.King Day
Mostly sunny, with a high near 26.
Monday Night
Mostly clear, with a low around 10.
Tuesday
Sunny, with a high near 32.
Tuesday Night
Mostly clear, with a low around 20.
Wednesday
Mostly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.5°N 89.81°W (Elev. 427 ft)
Last Update:
12:21 am CST Jan 15, 2026
Forecast Valid:
2am CST Jan 15, 2026-6pm CST Jan 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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