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

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

24°F

-4°C

Humidity 71%
Wind Speed Calm
Barometer 30.06 in (1019.3 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 5 Dec 9:54 am CST
Extended Forecast for

O'Fallon MO

  • Today

    Today: Increasing clouds, with a high near 40. Calm wind becoming south around 6 mph in the afternoon.

    High: 40 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 27. South wind around 6 mph becoming west after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 39. Calm wind becoming east around 5 mph in the afternoon.

    High: 39 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of snow between midnight and 3am, then a chance of rain after 3am. Mostly cloudy, with a low around 31. East wind around 6 mph becoming south after midnight. Chance of precipitation is 40%.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of rain before 9am, then a chance of snow. Mostly cloudy, with a high near 38. Southeast wind 6 to 11 mph becoming northwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 38 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 40. Calm wind becoming south around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 27. South wind around 6 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 39. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
A chance of snow between midnight and 3am, then a chance of rain after 3am. Mostly cloudy, with a low around 31. East wind around 6 mph becoming south after midnight. Chance of precipitation is 40%.
Sunday
A chance of rain before 9am, then a chance of snow. Mostly cloudy, with a high near 38. Southeast wind 6 to 11 mph becoming northwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 13.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 46.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Mostly cloudy, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.71°W (Elev. 535 ft)
Last Update:
10:26 am CST Dec 5, 2025
Forecast Valid:
10am CST Dec 5, 2025-6pm CST Dec 11, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation