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

46°F

8°C

Humidity 36%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 15 Feb 8:35 pm CST
Extended Forecast for

Sully IA

  • Tonight

    Tonight: Increasing clouds, with a low around 43. Light south wind becoming south southwest 5 to 10 mph in the evening.

    Low: 43 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 65. Southwest wind 6 to 11 mph.

    High: 65 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44. Southeast wind 5 to 7 mph.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 65. Windy, with a southeast wind 8 to 13 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 65 °F

    Mostly Cloudy
    then Partly
    Sunny and
    Windy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly before midnight. Partly cloudy, with a low around 48. Breezy, with a south southeast wind 14 to 17 mph becoming west southwest after midnight. Winds could gust as high as 28 mph.

    Low: 48 °F

    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: Sunny, with a high near 62. Windy.

    High: 62 °F

    Sunny and
    Windy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow before noon, then a chance of rain. Partly sunny, with a high near 54. Breezy. Chance of precipitation is 30%.

    High: 54 °F

    Chance
    Rain/Snow
    then Chance
    Rain and
    Breezy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 43. Light south wind becoming south southwest 5 to 10 mph in the evening.
Washington's Birthday
Mostly sunny, with a high near 65. Southwest wind 6 to 11 mph.
Monday Night
Mostly cloudy, with a low around 44. Southeast wind 5 to 7 mph.
Tuesday
Partly sunny, with a high near 65. Windy, with a southeast wind 8 to 13 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.
Tuesday Night
A 30 percent chance of rain, mainly before midnight. Partly cloudy, with a low around 48. Breezy, with a south southeast wind 14 to 17 mph becoming west southwest after midnight. Winds could gust as high as 28 mph.
Wednesday
Sunny, with a high near 62. Windy.
Wednesday Night
Partly cloudy, with a low around 35.
Thursday
A chance of rain and snow before noon, then a chance of rain. Partly sunny, with a high near 54. Breezy. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
Partly sunny, with a high near 38.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
Mostly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
7:51 pm CST Feb 15, 2026
Forecast Valid:
8pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation