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.

Overcast

25°F

-4°C

Humidity 63%
Wind Speed W 18 G 30 mph
Barometer 29.99 in
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 16 Mar 1:50 pm CDT
Extended Forecast for

Alton IL

  • This Afternoon

    This Afternoon: A chance of flurries. Mostly cloudy, with a high near 28. Breezy, with a west wind around 23 mph, with gusts as high as 34 mph.

    High: 28 °F

    Chance
    Flurries and
    Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 14. Northwest wind 13 to 18 mph, with gusts as high as 26 mph.

    Low: 14 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 34. Northwest wind 7 to 9 mph becoming south in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 4am, then a chance of rain. Mostly cloudy, with a low around 30. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 30 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of rain before 7am. Mostly sunny, with a high near 63. South wind around 10 mph becoming west in the afternoon.

    High: 63 °F

    Chance Rain
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A chance of flurries. Mostly cloudy, with a high near 28. Breezy, with a west wind around 23 mph, with gusts as high as 34 mph.
Tonight
Mostly cloudy, with a low around 14. Northwest wind 13 to 18 mph, with gusts as high as 26 mph.
Tuesday
Increasing clouds, with a high near 34. Northwest wind 7 to 9 mph becoming south in the afternoon.
Tuesday Night
A chance of snow before 4am, then a chance of rain. Mostly cloudy, with a low around 30. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Wednesday
A 30 percent chance of rain before 7am. Mostly sunny, with a high near 63. South wind around 10 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
Sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 49.
Sunday
Sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton IL
 38.91°N 90.16°W (Elev. 505 ft)
Last Update:
1:30 pm CDT Mar 16, 2026
Forecast Valid:
2pm CDT Mar 16, 2026-6pm CDT Mar 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation