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

Alton 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 54. South wind 11 to 15 mph, with gusts as high as 24 mph.

    Low: 54 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain and thunderstorms likely before 3pm, then rain and possibly a thunderstorm between 3pm and 4pm, then rain after 4pm. High near 66. Breezy, with a south wind 18 to 24 mph, with gusts as high as 39 mph. Chance of precipitation is 90%.

    High: 66 °F

    Breezy.
    Slight Chance
    T-storms then
    Rain

  • Sunday Night

    Sunday Night: Rain before 10pm, then a chance of snow. Low around 20. Windy, with a west wind 26 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 20 °F

    Windy.
    Rain/Snow
    then Chance
    Snow

  • Monday

    Monday: A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 27. Windy, with a northwest wind 22 to 30 mph, with gusts as high as 43 mph.

    High: 27 °F

    Slight Chance
    Snow and
    Windy

  • Monday Night

    Monday Night: Mostly clear, with a low around 13. Northwest wind 10 to 18 mph, with gusts as high as 28 mph.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.

    Low: 32 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

  • Wednesday

    Wednesday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 54. South wind 11 to 15 mph, with gusts as high as 24 mph.
Sunday
Rain and thunderstorms likely before 3pm, then rain and possibly a thunderstorm between 3pm and 4pm, then rain after 4pm. High near 66. Breezy, with a south wind 18 to 24 mph, with gusts as high as 39 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then a chance of snow. Low around 20. Windy, with a west wind 26 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. 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 27. Windy, with a northwest wind 22 to 30 mph, with gusts as high as 43 mph.
Monday Night
Mostly clear, with a low around 13. Northwest wind 10 to 18 mph, with gusts as high as 28 mph.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.
Wednesday
Sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton IL
 38.93°N 90.16°W (Elev. 505 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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Chance of Precipitation