Heavy to Excessive Rains in The Four Corners Region and Midwest; Heat Persists in the South-Central U.S.

Repeated rounds of showers and thunderstorms could bring a flash flooding threat across the Four Corners region and from the mid-Mississippi Valley into the lower Great Lakes. Hot temperatures and high humidity will continue to challenge daily records from the Southern Plains to the lower Mississippi Valley. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

83°F

28°C

Humidity 67%
Wind Speed S 5 mph
Barometer 30.19 in (1021.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 16 Sep 6:54 pm CDT
Extended Forecast for

2 Miles N O'Fallon MO

Heat Advisory September 16, 07:41pm until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 16, 07:41pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Heat index values as high as 106. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 73. South wind around 5 mph becoming calm  in the evening.

    Low: 73 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 94. Heat index values as high as 103. Light and variable wind.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Calm wind becoming south around 5 mph after midnight.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 95.

    High: 95 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm.  Partly sunny, with a high near 90. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 75. Light south wind.
Thursday
Sunny, with a high near 96. Heat index values as high as 106. Calm wind becoming southwest 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 73. South wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 94. Heat index values as high as 103. Light and variable wind.
Friday Night
Mostly clear, with a low around 74. Calm wind becoming south around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 95.
Saturday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 30%.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Chance of precipitation is 30%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 64.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 80.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N O'Fallon MO
 38.81°N 90.71°W (Elev. 502 ft)
6:06 pm CDT Sep 16, 2026
7pm CDT Sep 16, 2026-6pm CDT Sep 23, 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