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.

Fair

76°F

24°C

Humidity 54%
Wind Speed SW 8 mph
Barometer 29.90 in (1012.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 22 May 11:53 am CDT
Extended Forecast for

O'Fallon IL

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 77. West wind around 9 mph.

    High: 77 °F

    Chance
    Showers

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 60. Northwest wind around 6 mph becoming calm in the evening.

    Low: 60 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 80. East wind 5 to 7 mph becoming south in the afternoon.

    High: 80 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 66. Southeast wind around 6 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 84. South wind 8 to 11 mph. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely then
    T-storms
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.

    High: 83 °F

    Showers
    Likely then
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 77. West wind around 9 mph.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 60. Northwest wind around 6 mph becoming calm in the evening.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 80. East wind 5 to 7 mph becoming south in the afternoon.
Thursday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 66. Southeast wind around 6 mph. Chance of precipitation is 40%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 84. South wind 8 to 11 mph. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 81.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Sunday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Memorial Day
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75.
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ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon IL
 38.59°N 89.92°W (Elev. 551 ft)
Last Update:
8:22 am CDT May 22, 2024
Forecast Valid:
12pm CDT May 22, 2024-6pm CDT May 28, 2024
 
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