Showers and Storms in the East; Dangerously Hot and Dry in the West

A frontal boundary will bring scattered showers and storms to portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Intermountain West and expand into the Central U.S. by early next week. Elevated wildfire conditions will develop across portions of the Northern/Central Plains and air quality issues will persist in the Northwest. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

76°F

24°C

Humidity 82%
Wind Speed Calm
Barometer 30.03 in (1016.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 6 Aug 1:53 am CDT
Extended Forecast for

2 Miles E O'Fallon IL

Flood Watch until August 6, 10:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until August 6, 10:00am

    NOW until 10:00am Thu

    Flood Watch

  • Overnight

    Low: 71 °F

    T-storms
    Likely

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 1pm.  High near 81. Calm wind becoming southwest 5 to 7 mph in the morning.  Chance of precipitation is 90%.

    High: 81 °F

    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Scattered showers and thunderstorms, mainly after 10pm.  Mostly cloudy, with a low around 71. South wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 50%.

    Low: 71 °F

    Scattered
    T-storms

  • Friday

    Friday: Isolated showers and thunderstorms.  Partly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the morning.  Chance of precipitation is 20%.

    High: 88 °F

    Isolated
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm  in the evening.

    Low: 71 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 71. Light south wind. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms, mainly before 1pm. High near 81. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 90%.
Thursday Night
Scattered showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 71. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Friday
Isolated showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.
Friday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E O'Fallon IL
 38.59°N 89.86°W (Elev. 499 ft)
1:26 am CDT Aug 6, 2026
2am CDT Aug 6, 2026-6pm CDT Aug 12, 2026
 
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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