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

59°F

15°C

Humidity 72%
Wind Speed E 3 mph
Barometer 30.10 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 10 Oct 8:50 am CDT
Extended Forecast for

East Alton IL

  • Today

    Today: Increasing clouds, with a high near 83. Southeast wind 6 to 8 mph.

    High: 83 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. East wind 5 to 7 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Light south wind.

    Low: 64 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 95. Southwest wind 5 to 13 mph, with gusts as high as 20 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 81. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

Detailed Forecast

Today
Increasing clouds, with a high near 83. Southeast wind 6 to 8 mph.
Tonight
Mostly cloudy, with a low around 56. East wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 88. Light and variable wind.
Sunday Night
Mostly clear, with a low around 64. Light south wind.
Columbus Day
Sunny, with a high near 95. Southwest wind 5 to 13 mph, with gusts as high as 20 mph.
Monday Night
Clear, with a low around 71.
Tuesday
Sunny, with a high near 92.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 64.
Wednesday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 81. Chance of precipitation is 60%.
Wednesday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 54.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Alton IL
 38.88°N 90.11°W (Elev. 436 ft)
Last Update:
8:36 am CDT Oct 10, 2026
Forecast Valid:
9am CDT Oct 10, 2026-6pm CDT Oct 16, 2026
 
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