Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Grinnell IA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 80. North northeast wind around 7 mph.

    High: 80 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 59. North northeast wind 5 to 7 mph becoming calm  in the evening.

    Low: 59 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 2am.  Partly cloudy, with a low around 63. South wind 3 to 5 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A 10 percent chance of showers and thunderstorms before 7am.  Sunny, with a high near 83. Southwest wind 5 to 7 mph becoming west northwest in the afternoon.

    High: 83 °F

    Slight Chance
    T-storms then
    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms.  Mostly clear, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 80. North northeast wind around 7 mph.
Tonight
Partly cloudy, with a low around 59. North northeast wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 80. Light and variable wind.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 63. South wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A 10 percent chance of showers and thunderstorms before 7am. Sunny, with a high near 83. Southwest wind 5 to 7 mph becoming west northwest in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Mostly cloudy, with a low around 59.
Monday
Mostly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
1:26 pm CDT Aug 19, 2026
2pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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Hourly Weather Forecast

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