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.

Overcast

77°F

25°C

Humidity 83%
Wind Speed Vrbl 6 mph
Barometer 30.11 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 18 Jul 11:45 am CDT
Extended Forecast for

East Alton IL

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Southeast wind around 5 mph. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 73 °F

    Scattered
    T-storms

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 7am. Partly sunny, with a high near 91. Heat index values as high as 102. Light and variable wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 50%.

    High: 91 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 75. South wind 3 to 6 mph. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the morning.

    High: 93 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.

    Low: 76 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

    High: 94 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 77.

    Low: 77 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Southeast wind around 5 mph. Chance of precipitation is 20%.
Tonight
Scattered showers and thunderstorms. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Saturday
A chance of showers, with thunderstorms also possible after 7am. Partly sunny, with a high near 91. Heat index values as high as 102. Light and variable wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 75. South wind 3 to 6 mph. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the morning.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 77.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 98.
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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:
12:06 pm CDT Jul 18, 2025
Forecast Valid:
12pm CDT Jul 18, 2025-6pm CDT Jul 24, 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