Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Severe thunderstorms are expected across parts of the central and southern High Plains, central Great Lakes, and Ozarks Wednesday. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Partly Cloudy

71°F

22°C

Humidity 90%
Wind Speed Calm
Barometer 29.98 in (1014.8 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 26 Aug 4:53 am CDT
Extended Forecast for

2 Miles ESE O'Fallon IL

  • Today

    Today: Cloudy through mid morning, then gradual clearing, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 91 °F

    Gradual
    Clearing

  • Tonight

    Tonight: Isolated showers and thunderstorms before 8pm.  Partly cloudy, with a low around 67. West wind around 6 mph becoming calm  in the evening.  Chance of precipitation is 20%.

    Low: 67 °F

    Isolated
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. Light northwest wind becoming north 5 to 9 mph in the morning.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. North wind 5 to 7 mph becoming calm  in the evening.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Today
Cloudy through mid morning, then gradual clearing, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the morning.
Tonight
Isolated showers and thunderstorms before 8pm. Partly cloudy, with a low around 67. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 86. Light northwest wind becoming north 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 65. North wind 5 to 7 mph becoming calm in the evening.
Friday
Sunny, with a high near 85. Calm wind becoming northeast around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 88.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Mostly sunny, with a high near 95.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE O'Fallon IL
 38.59°N 89.89°W (Elev. 541 ft)
5:21 am CDT Aug 26, 2026
5am CDT Aug 26, 2026-6pm CDT Sep 1, 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