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.

A Few Clouds

80°F

27°C

Humidity 39%
Wind Speed E 6 mph
Barometer 30.18 in (1021.7 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 23 Jun 1:53 pm CDT
Extended Forecast for

2 Miles E O'Fallon IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 80. Light northeast wind.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 62. Northeast wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Southwest wind 3 to 8 mph.

    High: 83 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67. Southwest wind around 6 mph becoming calm in the evening.

    Low: 67 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 85. Light south wind. Chance of precipitation is 70%.

    High: 85 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: Showers and thunderstorms. Low around 68. Chance of precipitation is 80%.

    Low: 68 °F

    T-storms

  • Friday

    Friday: Showers and thunderstorms. High near 83. Chance of precipitation is 80%.

    High: 83 °F

    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.

    Low: 70 °F

    Showers
    Likely

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 88.

    High: 88 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 80. Light northeast wind.
Tonight
Partly cloudy, with a low around 62. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Southwest wind 3 to 8 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67. Southwest wind around 6 mph becoming calm in the evening.
Thursday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 85. Light south wind. Chance of precipitation is 70%.
Thursday Night
Showers and thunderstorms. Low around 68. Chance of precipitation is 80%.
Friday
Showers and thunderstorms. High near 83. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Sunday
Sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E O'Fallon IL
 38.59°N 89.86°W (Elev. 499 ft)
Last Update:
9:46 am CDT Jun 23, 2026
Forecast Valid:
2pm CDT Jun 23, 2026-6pm CDT Jun 29, 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