National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

60°F

16°C

Humidity 91%
Wind Speed Calm
Barometer 30.12 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 28 Aug 1:55 am CDT
Extended Forecast for

Grinnell IA

  • Overnight

    Overnight: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Calm wind becoming west southwest around 5 mph.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind becoming south 5 to 8 mph in the evening.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 85. South wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71. South wind 11 to 14 mph, with gusts as high as 24 mph.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Clear
    then Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 59. Calm wind.
Friday
Sunny, with a high near 83. Calm wind becoming west southwest around 5 mph.
Friday Night
Partly cloudy, with a low around 64. Calm wind becoming south 5 to 8 mph in the evening.
Saturday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 85. South wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 71. South wind 11 to 14 mph, with gusts as high as 24 mph.
Sunday
Mostly sunny, with a high near 93.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.
Monday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 90.
Tuesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 71.
Thursday
Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
1:26 am CDT Aug 28, 2026
Forecast Valid:
2am CDT Aug 28, 2026-6pm CDT Sep 3, 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