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

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

42°F

6°C

Humidity 57%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 16 Feb 1:55 am CST
Extended Forecast for

Hartwick IA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 41. South southwest wind 8 to 10 mph.

    Low: 41 °F

    Mostly Cloudy

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 64. Southwest wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 64 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. Southeast wind 5 to 7 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62. Breezy, with a south southeast wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 62 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain. Partly cloudy, with a low around 47. Breezy, with a south southeast wind 15 to 17 mph becoming west southwest after midnight. Winds could gust as high as 28 mph.

    Low: 47 °F

    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: Sunny, with a high near 60. Windy.

    High: 60 °F

    Sunny and
    Windy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 52.

    High: 52 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 24.

    Low: 24 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 41. South southwest wind 8 to 10 mph.
Washington's Birthday
Mostly sunny, with a high near 64. Southwest wind 6 to 13 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 42. Southeast wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 62. Breezy, with a south southeast wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.
Tuesday Night
A 40 percent chance of rain. Partly cloudy, with a low around 47. Breezy, with a south southeast wind 15 to 17 mph becoming west southwest after midnight. Winds could gust as high as 28 mph.
Wednesday
Sunny, with a high near 60. Windy.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 52.
Thursday Night
A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 24.
Friday
Partly sunny, with a high near 35.
Friday Night
Partly cloudy, with a low around 19.
Saturday
A 30 percent chance of snow. Mostly sunny, with a high near 38.
Saturday Night
Partly cloudy, with a low around 16.
Sunday
Mostly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.34°W
Last Update:
10:35 pm CST Feb 15, 2026
Forecast Valid:
2am CST Feb 16, 2026-6pm CST Feb 22, 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