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.

Partly Cloudy

82°F

28°C

Humidity 69%
Wind Speed Calm
Barometer 29.86 in (1010.8 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 9 Jul 6:53 pm CDT
Extended Forecast for

2 Miles ESE O'Fallon IL

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly between 1am and 5am. Mostly cloudy, with a low around 73. South wind 3 to 7 mph. Chance of precipitation is 70%.

    Low: 73 °F

    T-storms
    Likely

  • Friday

    Friday: Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 89. Southwest wind 5 to 7 mph becoming northwest in the afternoon. Chance of precipitation is 30%.

    High: 89 °F

    Scattered
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 71. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 71 °F

    T-storms
    Likely

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the morning.

    High: 85 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. North wind around 6 mph becoming calm in the evening.

    Low: 69 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly between 1am and 5am. Mostly cloudy, with a low around 73. South wind 3 to 7 mph. Chance of precipitation is 70%.
Friday
Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 89. Southwest wind 5 to 7 mph becoming northwest in the afternoon. Chance of precipitation is 30%.
Friday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 71. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the morning.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. North wind around 6 mph becoming calm in the evening.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Sunday Night
Mostly clear, with a low around 69.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 70.
Tuesday
Sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 71.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 72.
Thursday
Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE O'Fallon IL
 38.59°N 89.89°W (Elev. 541 ft)
Last Update:
6:06 pm CDT Jul 9, 2026
Forecast Valid:
7pm CDT Jul 9, 2026-6pm CDT Jul 16, 2026
 
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