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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

19°F

-7°C

Humidity 90%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 16°F (-9°C)
Visibility 7.00 mi
Last update 3 Dec 2:35 am CST
Extended Forecast for

2 Miles WSW Alton IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 17. South wind 3 to 5 mph.

    Low: 17 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain before 4pm, then a chance of rain and snow between 4pm and 5pm, then a chance of rain after 5pm. Mostly cloudy, with a high near 38. South wind 5 to 8 mph becoming light and variable. Chance of precipitation is 50%.

    High: 38 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 11. North wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 11 °F

    Snow Likely
    then Slight
    Chance Snow

  • Thursday

    Thursday: Sunny, with a high near 23. North wind 5 to 8 mph becoming light and variable in the afternoon.

    High: 23 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 10. Light and variable wind.

    Low: 10 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 17. South wind 3 to 5 mph.
Wednesday
A slight chance of rain before 4pm, then a chance of rain and snow between 4pm and 5pm, then a chance of rain after 5pm. Mostly cloudy, with a high near 38. South wind 5 to 8 mph becoming light and variable. Chance of precipitation is 50%.
Wednesday Night
Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 11. North wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
Sunny, with a high near 23. North wind 5 to 8 mph becoming light and variable in the afternoon.
Thursday Night
Partly cloudy, with a low around 10. Light and variable wind.
Friday
Mostly sunny, with a high near 37.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 36.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 35.
Sunday Night
Mostly cloudy, with a low around 21.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Alton IL
 38.88°N 90.19°W (Elev. 407 ft)
Last Update:
2:40 am CST Dec 3, 2025
Forecast Valid:
3am CST Dec 3, 2025-6pm CST Dec 9, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation