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

66°F

19°C

Humidity 39%
Wind Speed SE 8 mph
Barometer 29.92 in (1013.1 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 6 Nov 3:54 pm CST
Extended Forecast for

O'Fallon MO

  • Tonight

    Tonight: A 20 percent chance of rain between 2am and 3am. Increasing clouds, with a low around 55. Southeast wind around 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 55 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 71. West wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 71 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42. West wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: A 40 percent chance of rain after noon. Mostly cloudy, with a high near 66. Light and variable wind becoming west 5 to 10 mph in the afternoon.

    High: 66 °F

    Partly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 32. Northwest wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 32 °F

    Chance Rain
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of rain between 2am and 3am. Increasing clouds, with a low around 55. Southeast wind around 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 71. West wind 8 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 42. West wind around 6 mph becoming calm in the evening.
Saturday
A 40 percent chance of rain after noon. Mostly cloudy, with a high near 66. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Saturday Night
A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 32. Northwest wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
Mostly sunny, with a high near 41.
Sunday Night
Mostly clear, with a low around 23.
Monday
Sunny, with a high near 42.
Monday Night
Mostly clear, with a low around 27.
Veterans Day
Mostly sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 38.
Thursday
Mostly sunny, with a high near 62.
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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:
3:15 pm CST Nov 6, 2025
Forecast Valid:
4pm CST Nov 6, 2025-6pm CST Nov 13, 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