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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

68°F

20°C

Humidity 94%
Wind Speed Vrbl 5 mph
Barometer 29.89 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 21 Sep 6:50 am CDT
Extended Forecast for

Williamson IL

  • Today

    Today: A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 88. Southeast wind 5 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 68. South wind 3 to 5 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 80. North wind 5 to 8 mph becoming light and variable. Chance of precipitation is 80%.

    High: 80 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. North wind around 6 mph. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 73. North wind 5 to 8 mph.

    High: 73 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 71.

    High: 71 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 88. Southeast wind 5 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 68. South wind 3 to 5 mph. Chance of precipitation is 60%.
Sunday
Showers and possibly a thunderstorm. High near 80. North wind 5 to 8 mph becoming light and variable. Chance of precipitation is 80%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. North wind around 6 mph. Chance of precipitation is 70%.
Monday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 73. North wind 5 to 8 mph.
Monday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 71.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 54.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 77.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Williamson IL
 38.98°N 89.76°W (Elev. 597 ft)
Last Update:
5:22 am CDT Sep 21, 2024
Forecast Valid:
7am CDT Sep 21, 2024-6pm CDT Sep 27, 2024
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation