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.

Mostly Cloudy

65°F

18°C

Humidity 75%
Wind Speed N 3 mph
Barometer 30.10 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 2 Sep 1:35 am CDT
Extended Forecast for

2 Miles WSW Alton IL

  • Overnight

    Overnight: Isolated showers. Mostly cloudy, with a low around 59. Light northeast wind. Chance of precipitation is 20%.

    Low: 59 °F

    Isolated
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. Calm wind becoming north around 5 mph in the afternoon.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Sunny, with a high near 86. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 86 °F

    Sunny then
    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 55. West wind around 8 mph becoming northwest after midnight. Chance of precipitation is 70%.

    Low: 55 °F

    Showers
    Likely

  • Thursday

    Thursday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
Isolated showers. Mostly cloudy, with a low around 59. Light northeast wind. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 81. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 59. Light and variable wind.
Wednesday
A 20 percent chance of showers after 1pm. Sunny, with a high near 86. Calm wind becoming southwest 5 to 9 mph in the morning.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 55. West wind around 8 mph becoming northwest after midnight. Chance of precipitation is 70%.
Thursday
Mostly sunny, with a high near 73.
Thursday Night
Mostly clear, with a low around 55.
Friday
Mostly sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 50.
Saturday
Sunny, with a high near 76.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 52.
Monday
Mostly sunny, with a high near 77.
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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:
11:41 pm CDT Sep 1, 2025
Forecast Valid:
1am CDT Sep 2, 2025-6pm CDT Sep 8, 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