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

57°F

14°C

Humidity 51%
Wind Speed SE 13 mph
Barometer 29.81 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 14 Mar 8:50 pm CDT
Extended Forecast for

Williamson IL

Wind Advisory March 15, 10:00am until March 16, 12:00pm
Click here for hazard details and duration
Wind Advisory

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. South wind 11 to 16 mph, with gusts as high as 26 mph.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms before 3pm, then rain likely and possibly a thunderstorm between 3pm and 4pm, then rain after 4pm. High near 65. Windy, with a south wind 21 to 30 mph, with gusts as high as 40 mph. Chance of precipitation is 90%.

    High: 65 °F

    Slight Chance
    T-storms and
    Breezy then
    Rain and
    Windy

  • Sunday Night

    Sunday Night: Rain before 10pm, then a chance of snow. Low around 19. Windy, with a west wind 29 to 31 mph, with gusts as high as 44 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 19 °F

    Windy.
    Rain/Snow
    then Chance
    Snow

  • Monday

    Monday: A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 26. Windy, with a northwest wind 26 to 30 mph, with gusts as high as 43 mph.

    High: 26 °F

    Slight Chance
    Snow and
    Windy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12. Blustery, with a northwest wind 10 to 20 mph.

    Low: 12 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Chance Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 52. South wind 11 to 16 mph, with gusts as high as 26 mph.
Sunday
A chance of rain and thunderstorms before 3pm, then rain likely and possibly a thunderstorm between 3pm and 4pm, then rain after 4pm. High near 65. Windy, with a south wind 21 to 30 mph, with gusts as high as 40 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then a chance of snow. Low around 19. Windy, with a west wind 29 to 31 mph, with gusts as high as 44 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Monday
A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 26. Windy, with a northwest wind 26 to 30 mph, with gusts as high as 43 mph.
Monday Night
Partly cloudy, with a low around 12. Blustery, with a northwest wind 10 to 20 mph.
Tuesday
Mostly sunny, with a high near 34.
Tuesday Night
A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 29.
Wednesday
Mostly sunny, with a high near 61.
Wednesday Night
Partly cloudy, with a low around 38.
Thursday
Sunny, with a high near 69.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 69.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Williamson IL
 38.98°N 89.76°W (Elev. 597 ft)
Last Update:
8:31 pm CDT Mar 14, 2026
Forecast Valid:
9pm CDT Mar 14, 2026-6pm CDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation