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

61°F

16°C

Humidity 92%
Wind Speed SE 7 mph
Barometer 29.80 in
Dewpoint 58°F (14°C)
Visibility 7.00 mi
Last update 25 Dec 11:35 pm CST
Extended Forecast for

Alton ILSimilar City Names

  • Tonight

    Tonight: Partly cloudy, with a low around 56. South wind around 8 mph.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 65. Southwest wind 6 to 10 mph becoming northwest in the afternoon.

    High: 65 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 45. Northwest wind around 6 mph becoming calm.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 66. Southeast wind 6 to 10 mph.

    High: 66 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of rain after midnight. Cloudy, with a low around 59. South wind 7 to 10 mph.

    Low: 59 °F

    Cloudy then
    Chance Rain

  • Sunday

    Sunday: Rain likely, then showers and possibly a thunderstorm after 9am. High near 70. Chance of precipitation is 80%.

    High: 70 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.

    Low: 21 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy and
    Blustery

  • Monday

    Monday: Sunny, with a high near 27. Blustery.

    High: 27 °F

    Mostly Sunny
    and Blustery
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 56. South wind around 8 mph.
Friday
Partly sunny, with a high near 65. Southwest wind 6 to 10 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 45. Northwest wind around 6 mph becoming calm.
Saturday
Partly sunny, with a high near 66. Southeast wind 6 to 10 mph.
Saturday Night
A 40 percent chance of rain after midnight. Cloudy, with a low around 59. South wind 7 to 10 mph.
Sunday
Rain likely, then showers and possibly a thunderstorm after 9am. High near 70. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.
Monday
Sunny, with a high near 27. Blustery.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Mostly clear, with a low around 24.
New Year's Day
Sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton ILSimilar City Names
 38.91°N 90.16°W (Elev. 505 ft)
Last Update:
10:26 pm CST Dec 25, 2025
Forecast Valid:
11pm CST Dec 25, 2025-6pm CST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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