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

36°F

2°C

Humidity 87%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 32°F (0°C)
Visibility 5.00 mi
Last update 4 Mar 5:15 am CST
Extended Forecast for

Sully IA

  • Today

    Today: Mostly cloudy, with a high near 51. East northeast wind around 6 mph becoming calm in the afternoon.

    High: 51 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of drizzle, mainly after 11pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Chance
    Drizzle and
    Patchy Fog

  • Thursday

    Thursday: A chance of drizzle, mainly before 7am. Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 61. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 61 °F

    Chance
    Drizzle and
    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 47. Southeast wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm before noon, then rain likely between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. High near 69. Breezy, with a south southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 69 °F

    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before midnight, then a chance of rain after midnight. Low around 35. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Showers then
    Chance Rain

  • Saturday

    Saturday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 62. Breezy.

    High: 62 °F

    Sunny and
    Breezy

Detailed Forecast

Today
Mostly cloudy, with a high near 51. East northeast wind around 6 mph becoming calm in the afternoon.
Tonight
A chance of drizzle, mainly after 11pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 39. Calm wind.
Thursday
A chance of drizzle, mainly before 7am. Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 61. Calm wind becoming south southeast around 6 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 47. Southeast wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm before noon, then rain likely between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. High near 69. Breezy, with a south southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and possibly a thunderstorm before midnight, then a chance of rain after midnight. Low around 35. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Sunny, with a high near 50.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 62. Breezy.
Sunday Night
Clear, with a low around 43.
Monday
Sunny, with a high near 71. Breezy.
Monday Night
A 30 percent chance of rain. Mostly clear, with a low around 50.
Tuesday
A 50 percent chance of rain. Partly sunny, with a high near 65. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
4:51 am CST Mar 4, 2026
Forecast Valid:
5am CST Mar 4, 2026-6pm CDT Mar 10, 2026
 
Forecast Discussion
 
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Additional Resources

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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