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

82°F

28°C

Humidity 77%
Wind Speed S 16 G 23 mph
Barometer 29.76 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 21 Jun 12:15 am CDT
Extended Forecast for

Grinnell IA

Heat Advisory June 21, 12:00pm until June 22, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Mostly clear, with a low around 76. Windy, with a south southwest wind 18 to 21 mph, with gusts as high as 31 mph.

    Low: 76 °F

    Mostly Clear
    and Windy

  • Saturday

    Saturday: Sunny, with a high near 95. Heat index values as high as 103. Windy, with a south southwest wind 23 to 26 mph, with gusts as high as 37 mph.

    High: 95 °F

    Sunny and
    Windy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76. Windy, with a south southwest wind 17 to 23 mph, with gusts as high as 32 mph.

    Low: 76 °F

    Mostly Clear
    and Windy

  • Sunday

    Sunday: Sunny, with a high near 95. Windy, with a south southwest wind 18 to 23 mph, with gusts as high as 32 mph.

    High: 95 °F

    Sunny and
    Windy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. Windy, with a south wind 16 to 22 mph, with gusts as high as 30 mph.

    Low: 74 °F

    Mostly Clear
    and Windy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Breezy. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 93 °F

    Sunny and
    Breezy then
    Chance
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 68. Chance of precipitation is 80%.

    Low: 68 °F

    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 76. Windy, with a south southwest wind 18 to 21 mph, with gusts as high as 31 mph.
Saturday
Sunny, with a high near 95. Heat index values as high as 103. Windy, with a south southwest wind 23 to 26 mph, with gusts as high as 37 mph.
Saturday Night
Mostly clear, with a low around 76. Windy, with a south southwest wind 17 to 23 mph, with gusts as high as 32 mph.
Sunday
Sunny, with a high near 95. Windy, with a south southwest wind 18 to 23 mph, with gusts as high as 32 mph.
Sunday Night
Mostly clear, with a low around 74. Windy, with a south wind 16 to 22 mph, with gusts as high as 30 mph.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Breezy. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and possibly a thunderstorm. Low around 68. Chance of precipitation is 80%.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
11:01 pm CDT Jun 20, 2025
Forecast Valid:
12am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
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