National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

64°F

18°C

Humidity 87%
Wind Speed Calm
Barometer 30.16 in (1020.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 11 Sep 7:53 am CDT
Extended Forecast for

2 Miles WSW O'Fallon IL

  • Today

    Today: Sunny, with a high near 90. Calm wind becoming north around 6 mph in the afternoon.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 62. Northeast wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 94. Calm wind becoming south 5 to 7 mph in the morning.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Southeast wind around 6 mph.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95. Southwest wind 5 to 7 mph.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%.

    High: 95 °F

    Mostly Sunny
    then Isolated
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy

  • Monday

    Monday: Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%.

    High: 95 °F

    Mostly Sunny
    then Isolated
    T-storms

Detailed Forecast

Today
Sunny, with a high near 90. Calm wind becoming north around 6 mph in the afternoon.
Tonight
Mostly clear, with a low around 62. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 94. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 67. Southeast wind around 6 mph.
Saturday
Sunny, with a high near 95. Southwest wind 5 to 7 mph.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 68.
Monday
Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Isolated showers and thunderstorms. Sunny, with a high near 95. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Isolated showers and thunderstorms. Sunny, with a high near 92. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW O'Fallon IL
 38.59°N 89.95°W (Elev. 545 ft)
Last Update:
4:36 am CDT Sep 11, 2025
Forecast Valid:
8am CDT Sep 11, 2025-6pm CDT Sep 17, 2025
 
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