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.

Partly Cloudy

70°F

21°C

Humidity 83%
Wind Speed S 9 mph
Barometer 29.86 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 15 Apr 6:50 pm CDT
Extended Forecast for

2 Miles WSW Alton IL

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a slight chance of showers. Low around 62. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    Low: 62 °F

    T-storms

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 83. West wind 6 to 10 mph.

    High: 83 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable in the evening.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 51. South wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Saturday

    Saturday: A 40 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 63.

    High: 63 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 42.

    Low: 42 °F

    Clear

Detailed Forecast

Tonight
Showers and thunderstorms before 4am, then a slight chance of showers. Low around 62. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 83. West wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable in the evening.
Friday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Showers and possibly a thunderstorm. Low around 51. South wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Saturday
A 40 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 63.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 65.
Sunday Night
Clear, with a low around 42.
Monday
Sunny, with a high near 73.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 78.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Alton IL
 38.88°N 90.19°W (Elev. 407 ft)
Last Update:
6:56 pm CDT Apr 15, 2026
Forecast Valid:
7pm CDT Apr 15, 2026-6pm CDT Apr 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation