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

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Partly Cloudy with Haze

58°F

14°C

Humidity 87%
Wind Speed Calm
Barometer 29.72 in
Dewpoint 55°F (13°C)
Visibility 5.00 mi
Last update 15 Apr 6:55 am CDT
Extended Forecast for

Grinnell IA

  • Today

    Today: A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Some of the storms could be severe. Mostly cloudy, with a high near 72. South wind 5 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 72 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Some of the storms could be severe. Mostly cloudy, with a low around 53. East wind around 7 mph becoming west after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 53 °F

    Severe
    Thunderstorms
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Partly sunny, then gradually becoming sunny, with a high near 74. West wind 6 to 8 mph.

    High: 74 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. South wind 5 to 9 mph.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 77. Windy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Mostly Sunny
    and Breezy
    then T-storms
    Likely and
    Windy

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 36. Breezy. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 36 °F

    T-storms
    Likely then
    Showers
    Likely and
    Breezy

  • Saturday

    Saturday: A 20 percent chance of showers. Mostly sunny, with a high near 48. Windy.

    High: 48 °F

    Slight Chance
    Showers and
    Windy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. Blustery.

    Low: 30 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Some of the storms could be severe. Mostly cloudy, with a high near 72. South wind 5 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Some of the storms could be severe. Mostly cloudy, with a low around 53. East wind around 7 mph becoming west after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Partly sunny, then gradually becoming sunny, with a high near 74. West wind 6 to 8 mph.
Thursday Night
Mostly clear, with a low around 55. South wind 5 to 9 mph.
Friday
Showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 77. Windy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 36. Breezy. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 48. Windy.
Saturday Night
Partly cloudy, with a low around 30. Blustery.
Sunday
Sunny, with a high near 54.
Sunday Night
Mostly clear, with a low around 34.
Monday
Sunny, with a high near 67. Breezy.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Sunny, with a high near 71. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.69°W
Last Update:
6:46 am CDT Apr 15, 2026
Forecast Valid:
6am CDT Apr 15, 2026-6pm CDT Apr 21, 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