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

Washington Regional Airport (KFYG)

Lat: 38.59°NLon: 90.99°WElev: 489ft.

Fair

73°F

23°C

Humidity 100%
Wind Speed Calm
Barometer 29.91 in
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Last update 19 Aug 10:55 pm CDT
Extended Forecast for

5 Miles SW Marthasville MO

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before midnight.  Patchy fog after 3am.  Otherwise, mostly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  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 5am.  Otherwise, mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 9am.  Otherwise, sunny, with a high near 88. Calm wind.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm.  Sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers.  Mostly sunny, with a high near 84.

    High: 84 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before midnight. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 69. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 84. Calm wind becoming north around 5 mph in the afternoon.
Thursday Night
Patchy fog after 5am. Otherwise, mostly clear, with a low around 64. Calm wind.
Friday
Patchy fog before 9am. Otherwise, sunny, with a high near 88. Calm wind.
Friday Night
Mostly clear, with a low around 65. Calm wind.
Saturday
A 20 percent chance of showers before 1pm. Sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 63.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 84.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 65.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 88.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 89.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW Marthasville MO
 38.6°N 91.11°W (Elev. 551 ft)
9:46 pm CDT Aug 19, 2026
11pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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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