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

83°F

28°C

Humidity 63%
Wind Speed S 5 mph
Barometer 29.86 in (1010.4 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 13 Oct 6:54 pm CDT
Extended Forecast for

O'Fallon MO

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 70. Light and variable wind becoming southwest 5 to 7 mph. Chance of precipitation is 70%.

    Low: 70 °F

    Clear then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog between 9am and 10am. High near 77. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 90%.

    High: 77 °F

    Showers and
    Patchy Fog
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 66. East wind around 6 mph. Chance of precipitation is 70%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 81. East wind 5 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 48. Northwest wind 7 to 16 mph, with gusts as high as 25 mph.

    Low: 48 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 59. Breezy.

    High: 59 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 70. Light and variable wind becoming southwest 5 to 7 mph. Chance of precipitation is 70%.
Wednesday
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog between 9am and 10am. High near 77. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 90%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 66. East wind around 6 mph. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 81. East wind 5 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 100%.
Thursday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 48. Northwest wind 7 to 16 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 59. Breezy.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.71°W (Elev. 535 ft)
Last Update:
6:01 pm CDT Oct 13, 2026
Forecast Valid:
7pm CDT Oct 13, 2026-6pm CDT Oct 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation