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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Light Snow and Breezy

27°F

-3°C

Humidity 58%
Wind Speed NW 25 G 33 mph
Barometer 29.99 in (1016.0 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 16 Mar 12:53 pm CDT
Extended Forecast for

3 Miles NNE O'Fallon IL

  • This Afternoon

    This Afternoon: A chance of flurries. Mostly cloudy, with a high near 29. Blustery, with a west wind around 23 mph, with gusts as high as 36 mph.

    High: 29 °F

    Chance
    Flurries and
    Blustery

  • Tonight

    Tonight: Mostly cloudy, with a low around 15. Northwest wind 13 to 18 mph, with gusts as high as 28 mph.

    Low: 15 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 35. Northwest wind 7 to 10 mph becoming southwest in the afternoon.

    High: 35 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 4am, then a chance of rain. Mostly cloudy, with a low around 31. Southeast wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    Low: 31 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of rain before 7am. Mostly sunny, with a high near 63. South wind 10 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.

    High: 63 °F

    Chance Rain
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A chance of flurries. Mostly cloudy, with a high near 29. Blustery, with a west wind around 23 mph, with gusts as high as 36 mph.
Tonight
Mostly cloudy, with a low around 15. Northwest wind 13 to 18 mph, with gusts as high as 28 mph.
Tuesday
Increasing clouds, with a high near 35. Northwest wind 7 to 10 mph becoming southwest in the afternoon.
Tuesday Night
A chance of snow before 4am, then a chance of rain. Mostly cloudy, with a low around 31. Southeast wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of rain before 7am. Mostly sunny, with a high near 63. South wind 10 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE O'Fallon IL
 38.63°N 89.89°W (Elev. 518 ft)
Last Update:
1:30 pm CDT Mar 16, 2026
Forecast Valid:
1pm CDT Mar 16, 2026-6pm CDT Mar 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation