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

Hazardous Weather Conditions

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

79°F

26°C

Humidity 74%
Wind Speed Calm
Barometer 29.97 in (1013.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 14 Aug 7:54 pm CDT
Extended Forecast for

4 Miles NNE Defiance MO

Heat Advisory August 15, 12:00pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 70. Calm wind becoming southeast around 5 mph after midnight.

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 94. Heat index values as high as 101. Southwest wind 3 to 5 mph.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Light south wind.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Heat index values as high as 105. Light south wind.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 75. Calm wind.

    Low: 75 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 70. Calm wind becoming southeast around 5 mph after midnight.
Friday
Sunny, with a high near 94. Heat index values as high as 101. Southwest wind 3 to 5 mph.
Friday Night
Mostly clear, with a low around 75. Light south wind.
Saturday
Sunny, with a high near 96. Heat index values as high as 105. Light south wind.
Saturday Night
Clear, with a low around 75. Calm wind.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 75.
Tuesday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Defiance MO
 38.7°N 90.77°W (Elev. 650 ft)
Last Update:
8:01 pm CDT Aug 14, 2025
Forecast Valid:
8pm CDT Aug 14, 2025-6pm CDT Aug 21, 2025
 
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