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.

Fog/Mist

48°F

9°C

Humidity 87%
Wind Speed Vrbl 3 mph
Barometer 30.19 in
Dewpoint 45°F (7°C)
Visibility 4.00 mi
Last update 19 Nov 3:50 pm CST
Extended Forecast for

Alton IL

  • Tonight

    Tonight: A 20 percent chance of rain after 5am. Cloudy, with a low around 45. Southeast wind 3 to 5 mph.

    Low: 45 °F

    Cloudy then
    Slight Chance
    Rain

  • Thursday

    Thursday: A 40 percent chance of rain, mainly after 5pm. Cloudy, with a high near 60. Southeast wind 6 to 8 mph.

    High: 60 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm, then rain after 9pm. Low around 52. Southeast wind 3 to 6 mph. Chance of precipitation is 80%.

    Low: 52 °F

    Showers

  • Friday

    Friday: Rain. High near 61. East wind 6 to 10 mph. Chance of precipitation is 90%.

    High: 61 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 42. North wind 6 to 8 mph.

    Low: 42 °F

    Chance Rain
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of rain after 5am. Cloudy, with a low around 45. Southeast wind 3 to 5 mph.
Thursday
A 40 percent chance of rain, mainly after 5pm. Cloudy, with a high near 60. Southeast wind 6 to 8 mph.
Thursday Night
Showers likely and possibly a thunderstorm, then rain after 9pm. Low around 52. Southeast wind 3 to 6 mph. Chance of precipitation is 80%.
Friday
Rain. High near 61. East wind 6 to 10 mph. Chance of precipitation is 90%.
Friday Night
A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 42. North wind 6 to 8 mph.
Saturday
Mostly sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Mostly sunny, with a high near 62.
Sunday Night
Mostly cloudy, with a low around 43.
Monday
A 20 percent chance of rain. Mostly cloudy, with a high near 60.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 46.
Tuesday
A 40 percent chance of rain. Partly sunny, with a high near 58.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Mostly sunny, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton IL
 38.93°N 90.16°W (Elev. 505 ft)
Last Update:
3:16 pm CST Nov 19, 2025
Forecast Valid:
4pm CST Nov 19, 2025-6pm CST Nov 26, 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