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.

A Few Clouds

77°F

25°C

Humidity 88%
Wind Speed S 6 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 15 Oct 12:54 pm CDT
Extended Forecast for

O'Fallon MO

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Southwest wind 8 to 10 mph. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Increasing clouds, with a low around 45. Northwest wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Increasing clouds, with a high near 56. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 56 °F

    Increasing
    Clouds and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 37. North wind 6 to 14 mph, with gusts as high as 25 mph.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 59. Light and variable wind.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Southwest wind 8 to 10 mph. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Increasing clouds, with a low around 45. Northwest wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Friday
Increasing clouds, with a high near 56. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 37. North wind 6 to 14 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 59. Light and variable wind.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 70.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.71°W (Elev. 535 ft)
Last Update:
1:26 pm CDT Oct 15, 2026
Forecast Valid:
1pm CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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