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/Mist

41°F

5°C

Humidity 97%
Wind Speed W 10 mph
Barometer 29.76 in
Dewpoint 40°F (4°C)
Visibility 1.00 mi
Wind Chill35°F (2°C)
Last update 26 Dec 7:15 am CST
Extended Forecast for

Hartwick IA

Dense Fog Advisory December 26, 07:24am until December 26, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory December 26, 07:24am until December 26, 09:00am

    NOW until 9:00am Fri

    Dense Fog Advisory

  • Today

    High: 46 °F

    Areas Fog

  • Tonight

    Tonight: Patchy fog. Otherwise, mostly cloudy, with a low around 37. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 37 °F

    Patchy Fog

  • Saturday

    Saturday: Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 49. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 49 °F

    Areas Fog
    then Mostly
    Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 42. Light and variable wind becoming north northwest 5 to 7 mph after midnight.

    Low: 42 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 42. Windy, with a north northwest wind 8 to 13 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    High: 42 °F

    Chance Rain
    then Chance
    Rain/Snow and
    Windy

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 9. Windy.

    Low: 9 °F

    Windy. Slight
    Chance Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 21. Windy.

    High: 21 °F

    Mostly Sunny
    and Windy

  • Monday Night

    Monday Night: Mostly clear, with a low around 10.

    Low: 10 °F

    Mostly Clear

Detailed Forecast

Today
Areas of fog before 1pm. Otherwise, mostly cloudy, with a high near 46. North northwest wind 5 to 9 mph becoming calm in the afternoon.
Tonight
Patchy fog. Otherwise, mostly cloudy, with a low around 37. Calm wind becoming south southeast around 6 mph after midnight.
Saturday
Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 49. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 42. Light and variable wind becoming north northwest 5 to 7 mph after midnight.
Sunday
A chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 42. Windy, with a north northwest wind 8 to 13 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 9. Windy.
Monday
Mostly sunny, with a high near 21. Windy.
Monday Night
Mostly clear, with a low around 10.
Tuesday
Mostly sunny, with a high near 34.
Tuesday Night
Partly cloudy, with a low around 17.
Wednesday
Partly sunny, with a high near 27.
Wednesday Night
Mostly cloudy, with a low around 9.
New Year's Day
Mostly sunny, with a high near 24.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.34°W
Last Update:
7:01 am CST Dec 26, 2025
Forecast Valid:
7am CST Dec 26, 2025-6pm CST Jan 1, 2026
 
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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