Heat and Fire Weather Concerns West; Heavy Rain and Thunderstorms from Plains to mid-Atlantic

Thunderstorms and locally heavy rainfall is expected from the Central Plains to the Ohio Valley, mid-Atlantic and across the Southeast. Severe weather from the Upper Midwest to Central Plains increases on Friday. Major to Extreme HeatRisk continues across the Southern Plains to the lower Mississippi Valley late this week. Fire weather concerns for the northern Rockies and northern Plains today. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Mostly Cloudy

75°F

24°C

Humidity 78%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 10 Sep 12:50 pm CDT
Extended Forecast for

2 Miles E Williamson IL

  • This Afternoon

    This Afternoon: A chance of showers, with thunderstorms also possible after 3pm.  Mostly cloudy, with a high near 78. North wind 3 to 5 mph.  Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Tonight

    Tonight: Patchy fog after 3am.  Otherwise, mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: A 20 percent chance of showers after 1pm.  Patchy fog before 8am.  Otherwise, mostly cloudy, with a high near 82. Calm wind becoming east around 5 mph.

    High: 82 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the morning.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm.  Mostly sunny, with a high near 88. Chance of precipitation is 20%.

    High: 88 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 78. North wind 3 to 5 mph. Chance of precipitation is 30%.
Tonight
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 64. Calm wind.
Friday
A 20 percent chance of showers after 1pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming east around 5 mph.
Friday Night
Mostly cloudy, with a low around 66. Calm wind.
Saturday
Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the morning.
Saturday Night
Mostly clear, with a low around 66.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Sunny, with a high near 92.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 68.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Tuesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 61.
Wednesday
A 40 percent chance of showers. Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Williamson IL
 38.98°N 89.73°W (Elev. 600 ft)
1:01 pm CDT Sep 10, 2026
1pm CDT Sep 10, 2026-6pm CDT Sep 16, 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