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

61°F

16°C

Humidity 92%
Wind Speed Calm
Barometer 30.12 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 28 Aug 12:55 am CDT
Extended Forecast for

Hartwick IA

  • Overnight

    Overnight: Mostly clear, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84. Calm wind becoming west southwest around 5 mph.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind becoming south 5 to 7 mph in the evening.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of showers, mainly between 7am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South wind 8 to 14 mph, with gusts as high as 23 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 84 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71. South southeast wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 71 °F

    Partly Cloudy

  • Sunday

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

    High: 93 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 92.

    High: 92 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 58. Calm wind.
Friday
Sunny, with a high near 84. Calm wind becoming west southwest around 5 mph.
Friday Night
Partly cloudy, with a low around 64. Calm wind becoming south 5 to 7 mph in the evening.
Saturday
A 40 percent chance of showers, mainly between 7am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South wind 8 to 14 mph, with gusts as high as 23 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Partly cloudy, with a low around 71. South southeast wind 11 to 14 mph, with gusts as high as 23 mph.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 74.
Monday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 92.
Monday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Tuesday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 71.
Wednesday
Mostly sunny, with a high near 91.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 90.
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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:
11:21 pm CDT Aug 27, 2026
Forecast Valid:
1am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
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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