National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Severe Thunderstorms and Heat

Scattered severe thunderstorms and excessive rainfall are possible today in the Mid Atlantic, posing a risk for damaging winds and isolated flash flooding. Extreme Heat Warnings are in effect today for northeast Texas into southern Oklahoma and Arkansas. Extreme Heat Warnings are also in effect for the Desert Southwest today into Sunday. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Mostly Cloudy

72°F

22°C

Humidity 94%
Wind Speed N 6 mph
Barometer 30.00 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 20 Aug 7:50 am CDT
Extended Forecast for

2 Miles WSW Alton IL

  • Today

    Today: Isolated showers after 4pm. Partly sunny, with a high near 84. Northeast wind 3 to 8 mph. Chance of precipitation is 20%.

    High: 84 °F

    Mostly Cloudy
    then Isolated
    Showers

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 66. Northeast wind around 6 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 69. Light and variable wind.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 86. Light northwest wind increasing to 5 to 9 mph in the morning.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 64.

    Low: 64 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Isolated showers after 4pm. Partly sunny, with a high near 84. Northeast wind 3 to 8 mph. Chance of precipitation is 20%.
Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 66. Northeast wind around 6 mph becoming calm in the evening.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 69. Light and variable wind.
Saturday
Sunny, with a high near 86. Light northwest wind increasing to 5 to 9 mph in the morning.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Mostly cloudy, with a low around 64.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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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:
8:31 am CDT Aug 20, 2026
Forecast Valid:
8am CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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