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.

Overcast

50°F

10°C

Humidity 48%
Wind Speed E 3 mph
Barometer 29.78 in (1008.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 25 Feb 5:53 pm CST
Extended Forecast for

5 Miles N O'Fallon IL

  • Tonight

    Tonight: A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 35. Northeast wind 3 to 6 mph.

    Low: 35 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 54. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 54 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.

    Low: 35 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 69. Southwest wind 5 to 11 mph.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. South wind 6 to 8 mph becoming north after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain. Sunny, with a high near 62.

    High: 62 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and snow, mainly after noon. Cloudy, with a high near 43. Chance of precipitation is 40%.

    High: 43 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow likely, mainly before midnight. Cloudy, with a low around 30. Chance of precipitation is 70%.

    Low: 30 °F

    Rain/Snow
    Likely

Detailed Forecast

Tonight
A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 35. Northeast wind 3 to 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 54. Northeast wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 69. Southwest wind 5 to 11 mph.
Friday Night
Mostly clear, with a low around 41. South wind 6 to 8 mph becoming north after midnight.
Saturday
A 20 percent chance of rain. Sunny, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
A chance of rain and snow, mainly after noon. Cloudy, with a high near 43. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely, mainly before midnight. Cloudy, with a low around 30. Chance of precipitation is 70%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 40. Chance of precipitation is 30%.
Monday Night
A chance of rain or freezing rain. Cloudy, with a low around 28. Chance of precipitation is 40%.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 44.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 33.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles N O'Fallon IL
 38.66°N 89.92°W (Elev. 551 ft)
Last Update:
4:56 pm CST Feb 25, 2026
Forecast Valid:
6pm CST Feb 25, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation