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.

Fair

84°F

29°C

Humidity 55%
Wind Speed S 8 mph
Barometer 30.03 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 20 Jun 12:50 pm CDT
Extended Forecast for

3 Miles N West Alton MO

Extreme Heat Watch June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 92. South wind 9 to 11 mph.

    High: 92 °F

    Mostly Sunny

  • Tonight

    Tonight: Clear, with a low around 76. South wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 76 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76. South wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97. Southwest wind 7 to 10 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 95.

    High: 95 °F

    Slight Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 92. South wind 9 to 11 mph.
Tonight
Clear, with a low around 76. South wind 8 to 11 mph, with gusts as high as 21 mph.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 76. South wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny and hot, with a high near 97. Southwest wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny, with a high near 96.
Monday Night
Partly cloudy, with a low around 76.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles N West Alton MO
 38.91°N 90.22°W (Elev. 407 ft)
Last Update:
11:37 am CDT Jun 20, 2025
Forecast Valid:
1pm CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
Forecast Discussion
 
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Additional Resources

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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