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

Hazardous Weather Conditions

Current conditions at

Washington Regional Airport (KFYG)

Lat: 38.59°NLon: 90.99°WElev: 489ft.

Haze

86°F

30°C

Humidity 55%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 68°F (20°C)
Visibility 6.00 mi
Heat Index89°F (32°C)
Last update 20 Jun 4:15 pm CDT
Extended Forecast for

Marthasville MO

Flood Watch June 21, 01:00am until June 21, 07:00pm
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Partly sunny, with a high near 85. Calm wind. Chance of precipitation is 20%.

    High: 85 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Increasing clouds, with a low around 66. Calm wind.

    Low: 66 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms, mainly before 3pm. High near 84. Light and variable wind becoming southwest 8 to 13 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 90%.

    High: 84 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 3am, then isolated showers. Low around 63. Southwest wind 5 to 9 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    Low: 63 °F

    T-storms then
    Scattered
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 77. North wind 3 to 6 mph.

    High: 77 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Partly sunny, with a high near 85. Calm wind. Chance of precipitation is 20%.
Tonight
Increasing clouds, with a low around 66. Calm wind.
Sunday
Showers and thunderstorms, mainly before 3pm. High near 84. Light and variable wind becoming southwest 8 to 13 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms before 3am, then isolated showers. Low around 63. Southwest wind 5 to 9 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Monday
Partly sunny, with a high near 77. North wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marthasville MO
 38.62°N 91.06°W (Elev. 476 ft)
Last Update:
2:51 pm CDT Jun 20, 2026
Forecast Valid:
4pm CDT Jun 20, 2026-6pm CDT Jun 27, 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