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

47°F

8°C

Humidity 22%
Wind Speed SW 8 mph
Barometer 30.09 in (1019.7 mb)
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 15 Dec 3:54 pm CST
Extended Forecast for

O'Fallon MO

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Southwest wind 5 to 7 mph.

    Low: 28 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind 7 to 10 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. South wind around 6 mph becoming light and variable after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 52. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 52 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature rising to around 51 by 3am. South wind 6 to 13 mph, with gusts as high as 23 mph.

    Low: 43 °F⇑

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly before noon. Partly sunny, with a temperature rising to near 55 by 8am, then falling to around 44 during the remainder of the day. Chance of precipitation is 70%.

    High: 55 °F⇓

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 39.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 28. Southwest wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 51. Southwest wind 7 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 34. South wind around 6 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 52. Calm wind becoming southeast around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature rising to around 51 by 3am. South wind 6 to 13 mph, with gusts as high as 23 mph.
Thursday
Showers likely, mainly before noon. Partly sunny, with a temperature rising to near 55 by 8am, then falling to around 44 during the remainder of the day. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 33.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Mostly cloudy, with a low around 34.
Monday
Partly sunny, with a high near 53.
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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:
3:16 pm CST Dec 15, 2025
Forecast Valid:
4pm CST Dec 15, 2025-6pm CST Dec 22, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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