Dangerous Heat in the Southwest; Severe Thunderstorms from the Central Plains into the Ohio Valley

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Isolated to widely scattered severe storms are expected across parts of the central and southern High Plains, Great Lakes into the Ohio Valley, and parts of the Ozarks to Lower Mississippi Valley today. Read More >

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Partly Cloudy

79°F

26°C

Humidity 58%
Wind Speed NW 9 mph
Barometer 30.03 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 26 Aug 3:15 pm CDT
Extended Forecast for

Sully IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 83. Northwest wind around 11 mph, with gusts as high as 20 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. North northwest wind 3 to 6 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. North northwest wind 3 to 7 mph.

    High: 82 °F

    Sunny

  • Thursday Night

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

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm.  Partly sunny, with a high near 88. Breezy.  Chance of precipitation is 30%.

    High: 88 °F

    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 71. Breezy.

    Low: 71 °F

    Partly Cloudy
    and Breezy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 98. Breezy.

    High: 98 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

Detailed Forecast

This Afternoon
Sunny, with a high near 83. Northwest wind around 11 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 61. North northwest wind 3 to 6 mph.
Thursday
Sunny, with a high near 82. North northwest wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 59. Calm wind.
Friday
Sunny, with a high near 85. Light and variable wind.
Friday Night
Partly cloudy, with a low around 66.
Saturday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 88. Breezy. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Breezy.
Sunday
Mostly sunny and hot, with a high near 98. Breezy.
Sunday Night
A 40 percent chance of showers. Partly cloudy, with a low around 75.
Monday
Partly sunny, with a high near 96.
Monday Night
A 30 percent chance of showers. Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
1:43 pm CDT Aug 26, 2026
3pm CDT Aug 26, 2026-6pm CDT Sep 1, 2026
 
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Additional Resources

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Hourly Weather Forecast

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