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.

Overcast

70°F

21°C

Humidity 94%
Wind Speed SE 12 mph
Barometer 29.80 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 28 Jun 5:55 am CDT
Extended Forecast for

Sully IA

Extreme Heat Warning June 28, 01:00pm until June 30, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: Partly sunny, with a high near 92. Heat index values as high as 103. Breezy, with a southeast wind 14 to 20 mph, with gusts as high as 28 mph.

    High: 92 °F

    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Breezy, with a south wind 10 to 17 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 95. Heat index values as high as 107. Windy, with a south wind 11 to 21 mph, with gusts as high as 30 mph.

    High: 95 °F

    Sunny and
    Windy

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 30 mph.

    Low: 77 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Breezy, with a south southwest wind 13 to 17 mph, with gusts as high as 26 mph.

    High: 95 °F

    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74. Breezy.

    Low: 74 °F

    Slight Chance
    T-storms and
    Breezy

  • Wednesday

    Wednesday: Sunny, with a high near 95. Breezy.

    High: 95 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 92. Heat index values as high as 103. Breezy, with a southeast wind 14 to 20 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 75. Breezy, with a south wind 10 to 17 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 95. Heat index values as high as 107. Windy, with a south wind 11 to 21 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 77. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 30 mph.
Tuesday
Sunny, with a high near 95. Breezy, with a south southwest wind 13 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74. Breezy.
Wednesday
Sunny, with a high near 95. Breezy.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Thursday
Mostly sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 73.
Friday
Sunny, with a high near 94.
Friday Night
Mostly clear, with a low around 72.
Independence Day
Sunny, with a high near 94.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
5:26 am CDT Jun 28, 2026
Forecast Valid:
6am CDT Jun 28, 2026-6pm CDT Jul 4, 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