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

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

82°F

28°C

Humidity 78%
Wind Speed Calm
Barometer 29.93 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 26 Jul 11:15 am CDT
Extended Forecast for

Deep River IA

Extreme Heat Watch July 26, 09:00pm until July 27, 10:00pm
Extreme Heat Warning July 26, 12:00pm until July 26, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning

  • Today

    Today: Mostly sunny, with a high near 96. Heat index values as high as 113. West southwest wind 5 to 8 mph.

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 2am and 4am. Partly cloudy, with a low around 76. South southwest wind 8 to 10 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 96. Heat index values as high as 110. West wind 8 to 10 mph.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. North northwest wind 6 to 8 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. Northeast wind 5 to 7 mph.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 96. Heat index values as high as 113. West southwest wind 5 to 8 mph.
Tonight
A slight chance of showers and thunderstorms between 2am and 4am. Partly cloudy, with a low around 76. South southwest wind 8 to 10 mph. Chance of precipitation is 20%.
Monday
Sunny, with a high near 96. Heat index values as high as 110. West wind 8 to 10 mph.
Monday Night
Mostly clear, with a low around 71. North northwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 90. Northeast wind 5 to 7 mph.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Mostly sunny, with a high near 89.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 67.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Deep River IA
 41.57°N 92.37°W
Last Update:
6:31 am CDT Jul 26, 2026
Forecast Valid:
11am CDT Jul 26, 2026-6pm CDT Aug 1, 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