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.

Fog

68°F

20°C

Humidity 98%
Wind Speed SE 6 mph
Barometer 29.97 in
Dewpoint 67°F (19°C)
Visibility 0.50 mi
Last update 25 Jul 7:15 am CDT
Extended Forecast for

4 Miles S Gilman IA

Extreme Heat Watch July 26, 09:00pm until July 27, 10:00pm
Dense Fog Advisory July 25, 07:34am until July 25, 09:00am
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
  •  
    Dense Fog Advisory July 25, 07:34am until July 25, 09:00am

    NOW until 9:00am Sat

    Dense Fog Advisory

  • Today

    High: 90 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 71. Calm wind becoming southwest around 5 mph after midnight.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 94. Heat index values as high as 107. Southwest wind 5 to 9 mph.

    High: 94 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southwest wind around 9 mph.

    Low: 74 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: Sunny, with a high near 94. Southwest wind around 9 mph becoming west northwest in the afternoon.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Today
Areas of dense fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 90. South southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 71. Calm wind becoming southwest around 5 mph after midnight.
Sunday
Partly sunny, with a high near 94. Heat index values as high as 107. Southwest wind 5 to 9 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southwest wind around 9 mph.
Monday
Sunny, with a high near 94. Southwest wind around 9 mph becoming west northwest in the afternoon.
Monday Night
Mostly clear, with a low around 70.
Tuesday
Mostly sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Friday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Gilman IA
 41.82°N 92.78°W
Last Update:
7:27 am CDT Jul 25, 2026
Forecast Valid:
7am CDT Jul 25, 2026-6pm CDT Jul 31, 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