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 >

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

77°F

25°C

Humidity 64%
Wind Speed Calm
Barometer 30.19 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 28 Aug 11:15 am CDT
Extended Forecast for

Hartwick IA

  • Today

    Today: Sunny, with a high near 82. Light southwest wind.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 64. South wind 3 to 8 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 20 percent chance of showers before noon. Cloudy through mid morning, then gradual clearing, with a high near 84. Breezy, with a south wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 84 °F

    Slight Chance
    Showers then
    Decreasing
    Clouds and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72. South wind 11 to 15 mph, with gusts as high as 26 mph.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. South wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 90 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 74 °F

    Partly Cloudy
    then Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: Partly sunny, with a high near 92.

    High: 92 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 82. Light southwest wind.
Tonight
Increasing clouds, with a low around 64. South wind 3 to 8 mph.
Saturday
A 20 percent chance of showers before noon. Cloudy through mid morning, then gradual clearing, with a high near 84. Breezy, with a south wind 8 to 16 mph, with gusts as high as 26 mph.
Saturday Night
Mostly clear, with a low around 72. South wind 11 to 15 mph, with gusts as high as 26 mph.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. South wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Mostly sunny, with a high near 92.
Monday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73.
Tuesday
Partly sunny, with a high near 92.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Wednesday
Mostly sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 72.
Thursday
Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.34°W
Last Update:
10:22 am CDT Aug 28, 2026
Forecast Valid:
11am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation