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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Partly Cloudy

74°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 29.91 in (1011.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 19 Aug 10:54 pm CDT
Extended Forecast for

4 Miles NNW Defiance MO

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 1am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 84. Calm wind becoming north around 5 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 65. Light northeast wind.

    Low: 65 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 9am. Otherwise, sunny, with a high near 87. Calm wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 85.

    High: 85 °F

    Slight Chance
    Showers

  • Saturday Night

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

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms before 1am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 70. Calm wind.
Thursday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 84. Calm wind becoming north around 5 mph in the afternoon.
Thursday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 65. Light northeast wind.
Friday
Patchy fog before 9am. Otherwise, sunny, with a high near 87. Calm wind.
Friday Night
Mostly clear, with a low around 67. Calm wind.
Saturday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 65.
Sunday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 83.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.
Monday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 84.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 67.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Defiance MO
 38.7°N 90.8°W (Elev. 676 ft)
Last Update:
9:46 pm CDT Aug 19, 2026
Forecast Valid:
11pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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