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

84°F

29°C

Humidity 43%
Wind Speed Calm
Barometer 29.97 in (1014.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 11 Oct 1:54 pm CDT
Extended Forecast for

O'Fallon MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Light southwest wind.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. Light and variable wind becoming south around 6 mph in the evening.

    Low: 64 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. Southwest wind 5 to 8 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. Southwest wind 6 to 8 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.

    Low: 71 °F

    Partly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 64. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.

    High: 76 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Light southwest wind.
Tonight
Mostly clear, with a low around 64. Light and variable wind becoming south around 6 mph in the evening.
Columbus Day
Sunny, with a high near 93. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 71. Southwest wind 5 to 8 mph.
Tuesday
Sunny, with a high near 91. Southwest wind 6 to 8 mph.
Tuesday Night
Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 64. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 54.
Friday
Partly sunny, with a high near 65. Breezy.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.71°W (Elev. 535 ft)
Last Update:
1:26 pm CDT Oct 11, 2026
Forecast Valid:
2pm CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
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