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.

Fair

70°F

21°C

Humidity 93%
Wind Speed Calm
Barometer 29.93 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 9 Jun 4:15 am CDT
Extended Forecast for

Sully IA

Heat Advisory June 9, 01:00pm until June 9, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Mostly sunny, with a high near 91. Heat index values as high as 100. Light and variable wind becoming south 5 to 10 mph in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between midnight and 2am. Partly cloudy, with a low around 73. South southeast wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 5pm. Mostly sunny, with a high near 90. Windy, with a south southwest wind 14 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Windy. Slight
    Chance
    T-storms then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 66. Breezy, with a southwest wind 13 to 18 mph becoming light after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    T-storms and
    Breezy then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. High near 83. South wind 6 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 83 °F

    Showers then
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly clear, with a low around 57. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 91. Heat index values as high as 100. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Tonight
A slight chance of showers and thunderstorms between midnight and 2am. Partly cloudy, with a low around 73. South southeast wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Wednesday
Showers and thunderstorms likely, mainly after 5pm. Mostly sunny, with a high near 90. Windy, with a south southwest wind 14 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm. Low around 66. Breezy, with a southwest wind 13 to 18 mph becoming light after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. High near 83. South wind 6 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly clear, with a low around 57. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Sunny, with a high near 82.
Friday Night
Clear, with a low around 61.
Saturday
Sunny, with a high near 84.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 40%.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 55.
Monday
Mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
1:27 am CDT Jun 9, 2026
Forecast Valid:
4am CDT Jun 9, 2026-6pm CDT Jun 15, 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