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

Showers and Storms in the East; Dangerously Hot and Dry in the West

Scattered showers and storms are expected across portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Desert Southwest and Intermountain West. Hot, dry weather and increasing winds will allow elevated wildfire conditions to return to the northern Intermountain West, where air quality issues persist from ongoing fires. Read More >

Current conditions at

Washington Regional Airport (KFYG)

Lat: 38.59°NLon: 90.99°WElev: 489ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Marthasville MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 90. Heat index values as high as 101. West wind 3 to 7 mph.

    High: 90 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Light south wind.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 90. Heat index values as high as 100. Light and variable wind.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. Light southeast wind.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 95. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 90. Heat index values as high as 101. West wind 3 to 7 mph.
Tonight
Partly cloudy, with a low around 69. Light south wind.
Saturday
Sunny, with a high near 90. Heat index values as high as 100. Light and variable wind.
Saturday Night
Mostly clear, with a low around 71. Light southeast wind.
Sunday
Sunny, with a high near 95. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marthasville MO
 38.62°N 91.06°W (Elev. 476 ft)
Last Update:
12:06 pm CDT Aug 7, 2026
Forecast Valid:
12pm CDT Aug 7, 2026-6pm CDT Aug 13, 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