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

60°F

16°C

Humidity 86%
Wind Speed S 5 mph
Barometer 29.80 in (1008.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 3:53 am CST
Extended Forecast for

2 Miles E O'Fallon IL

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 79. South wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 79 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 43. North wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 43 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. North wind 3 to 7 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 58. Light east wind becoming southeast 6 to 11 mph in the morning.

    High: 58 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 3am, then showers likely. Low around 47. Chance of precipitation is 80%.

    Low: 47 °F

    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Partly sunny, with a high near 67.

    High: 67 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.

    High: 62 °F

    Chance Rain

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 79. South wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Tonight
Mostly clear, with a low around 43. North wind 6 to 10 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 59. North wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 36. Calm wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 58. Light east wind becoming southeast 6 to 11 mph in the morning.
Monday Night
Showers and possibly a thunderstorm before 3am, then showers likely. Low around 47. Chance of precipitation is 80%.
Tuesday
A 20 percent chance of showers before noon. Partly sunny, with a high near 67.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 45.
Wednesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Thursday
Rain and possibly a thunderstorm. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 64.
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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:
3:16 am CST Nov 15, 2025
Forecast Valid:
4am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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