National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

74°F

23°C

Humidity 97%
Wind Speed Calm
Barometer 30.12 in (1019.1 mb)
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Last update 25 Jun 4:54 am CDT
Extended Forecast for

O'Fallon MO

Heat Advisory June 25, 05:33am until June 26, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 25, 05:33am until June 26, 09:00pm

    NOW until 9:00pm Thu

    Heat Advisory

  • Today

    High: 94 °F

    Sunny then
    Scattered
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 75. South wind 5 to 7 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Isolated showers and thunderstorms after 4pm. Sunny, with a high near 94. Heat index values as high as 101. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.

    High: 94 °F

    Sunny then
    Isolated
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 76. Southwest wind around 6 mph.

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Southwest wind 5 to 8 mph.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly after 5pm. Sunny, with a high near 94. Heat index values as high as 102. Calm wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 30%.
Tonight
Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 75. South wind 5 to 7 mph. Chance of precipitation is 20%.
Thursday
Isolated showers and thunderstorms after 4pm. Sunny, with a high near 94. Heat index values as high as 101. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 76. Southwest wind around 6 mph.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Southwest wind 5 to 8 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.81°N 90.71°W (Elev. 502 ft)
Last Update:
5:21 am CDT Jun 25, 2025
Forecast Valid:
5am CDT Jun 25, 2025-6pm CDT Jul 1, 2025
 
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