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

34°F

1°C

Humidity 50%
Wind Speed Calm
Barometer 30.51 in (1033.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 11 Jan 5:53 pm CST
Extended Forecast for

2 Miles E O'Fallon IL

  • Tonight

    Tonight: Clear, with a low around 25. Southwest wind 3 to 6 mph.

    Low: 25 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 52. Southwest wind 6 to 10 mph.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. Southwest wind 3 to 7 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60. Southwest wind 8 to 14 mph, with gusts as high as 21 mph.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature rising to near 42 by 10am, then falling to around 35 during the remainder of the day. Breezy.

    High: 42 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. Blustery.

    Low: 19 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 25. Southwest wind 3 to 6 mph.
Monday
Sunny, with a high near 52. Southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 35. Southwest wind 3 to 7 mph.
Tuesday
Mostly sunny, with a high near 60. Southwest wind 8 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 8 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, with a temperature rising to near 42 by 10am, then falling to around 35 during the remainder of the day. Breezy.
Wednesday Night
Mostly cloudy, with a low around 19. Blustery.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 32.
Saturday Night
Partly cloudy, with a low around 15.
Sunday
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E O'Fallon IL
 38.59°N 89.86°W (Elev. 499 ft)
Last Update:
4:36 pm CST Jan 11, 2026
Forecast Valid:
6pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
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