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

48°F

9°C

Humidity 54%
Wind Speed Calm
Barometer 29.61 in (1002.5 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 18 Feb 7:54 pm CST
Extended Forecast for

O'Fallon MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 48. Light southeast wind.

    Low: 48 °F

    Mostly Cloudy

  • Thursday

    Thursday: Scattered showers and thunderstorms, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 71. South wind 5 to 10 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 50%.

    High: 71 °F

    Scattered
    T-storms then
    Isolated
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 36. West wind 11 to 18 mph, with gusts as high as 29 mph.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 49. West wind 6 to 16 mph, with gusts as high as 28 mph.

    High: 49 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30. Northwest wind around 6 mph.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of rain and snow. Mostly sunny, with a high near 44. Chance of precipitation is 20%.

    High: 44 °F

    Slight Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 39.

    High: 39 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 19.

    Low: 19 °F

    Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 48. Light southeast wind.
Thursday
Scattered showers and thunderstorms, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 71. South wind 5 to 10 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 50%.
Thursday Night
Mostly clear, with a low around 36. West wind 11 to 18 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 49. West wind 6 to 16 mph, with gusts as high as 28 mph.
Friday Night
Partly cloudy, with a low around 30. Northwest wind around 6 mph.
Saturday
A slight chance of rain and snow. Mostly sunny, with a high near 44. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 24.
Sunday
Sunny, with a high near 39.
Sunday Night
Clear, with a low around 19.
Monday
Sunny, with a high near 38.
Monday Night
Mostly clear, with a low around 22.
Tuesday
Mostly sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
A 20 percent chance of rain. Partly sunny, with a high near 57.
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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:
7:56 pm CST Feb 18, 2026
Forecast Valid:
8pm CST Feb 18, 2026-6pm CST Feb 25, 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