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 and Breezy

63°F

17°C

Humidity 68%
Wind Speed S 21 G 30 mph
Barometer 29.45 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 15 Mar 8:45 am 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

  • Today

    Today: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 3pm. Temperature rising to near 66 by noon, then falling to around 54 during the remainder of the day. Breezy, with a south wind 21 to 23 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.

    High: 66 °F⇓

    Breezy.
    Isolated
    Showers then
    T-storms

  • Tonight

    Tonight: Rain before 10pm, then a chance of rain and snow between 10pm and midnight, then a chance of snow after midnight. Low around 21. Breezy, with a northwest wind 22 to 26 mph, with gusts as high as 48 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 21 °F

    Rain/Snow and
    Breezy then
    Chance Snow
    and Blustery

  • Monday

    Monday: A chance of snow before noon, then scattered flurries between noon and 2pm. Cloudy, with a high near 27. Blustery, with a northwest wind 21 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 30%.

    High: 27 °F

    Blustery.
    Chance Snow
    then
    Scattered
    Flurries

  • Monday Night

    Monday Night: Mostly clear, with a low around 13. Northwest wind 10 to 17 mph, with gusts as high as 26 mph.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 35. Northwest wind around 6 mph becoming south in the afternoon.

    High: 35 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow between 1am and 4am, then a chance of rain after 4am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of rain before 7am. Partly sunny, with a high near 62.

    High: 62 °F

    Chance Rain
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

Detailed Forecast

Today
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 3pm. Temperature rising to near 66 by noon, then falling to around 54 during the remainder of the day. Breezy, with a south wind 21 to 23 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.
Tonight
Rain before 10pm, then a chance of rain and snow between 10pm and midnight, then a chance of snow after midnight. Low around 21. Breezy, with a northwest wind 22 to 26 mph, with gusts as high as 48 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday
A chance of snow before noon, then scattered flurries between noon and 2pm. Cloudy, with a high near 27. Blustery, with a northwest wind 21 to 25 mph, with gusts as high as 43 mph. Chance of precipitation is 30%.
Monday Night
Mostly clear, with a low around 13. Northwest wind 10 to 17 mph, with gusts as high as 26 mph.
Tuesday
Mostly sunny, with a high near 35. Northwest wind around 6 mph becoming south in the afternoon.
Tuesday Night
A chance of snow between 1am and 4am, then a chance of rain after 4am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of rain before 7am. Partly sunny, with a high near 62.
Wednesday Night
Partly cloudy, with a low around 41.
Thursday
Sunny, with a high near 70.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 75.
Friday Night
Mostly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton IL
 38.91°N 90.13°W (Elev. 499 ft)
Last Update:
9:21 am CDT Mar 15, 2026
Forecast Valid:
9am CDT Mar 15, 2026-6pm CDT Mar 21, 2026
 
Forecast Discussion
 
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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