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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Hazardous Weather Conditions

Current conditions at

Marshall Memorial Municipal Airport (KMHL)

Lat: 39.1°NLon: 93.2°WElev: 779ft.

Fair

73°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 30.16 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 18 Sep 2:35 am CDT
Extended Forecast for

Grand Pass MO

  • Overnight

    Overnight: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 71. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 71 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 100. Southwest wind 6 to 9 mph.

    High: 94 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 68. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Showers

  • Monday

    Monday: A chance of showers before 1pm. Mostly cloudy, with a high near 72. Chance of precipitation is 50%.

    High: 72 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 70. Calm wind.
Friday
Sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Increasing clouds, with a low around 71. Calm wind becoming south southwest around 5 mph after midnight.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 100. Southwest wind 6 to 9 mph.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 68. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 61. Chance of precipitation is 80%.
Monday
A chance of showers before 1pm. Mostly cloudy, with a high near 72. Chance of precipitation is 50%.
Monday Night
Mostly cloudy, with a low around 55.
Tuesday
Mostly cloudy, with a high near 68.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Pass MO
 39.21°N 93.43°W (Elev. 663 ft)
Last Update:
1:56 am CDT Sep 18, 2026
Forecast Valid:
2am CDT Sep 18, 2026-6pm CDT Sep 24, 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