| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 12:02 pm CDT Jun 23, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| This Afternoon |
Mostly cloudy, with a high near 78. South southwest wind around 8 mph. |
| Tonight |
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 59. South wind 3 to 5 mph. Chance of precipitation is 30%. |
| Wednesday |
A 30 percent chance of showers and thunderstorms, mainly before 10am. Mostly sunny, with a high near 82. Light and variable wind becoming west 5 to 8 mph in the morning. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Wednesday Night |
Partly cloudy, with a low around 58. West wind around 6 mph becoming calm in the evening. |
| Thursday |
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 78. Light north northeast wind. |
| Thursday Night |
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 57. |
| Friday |
Mostly sunny, with a high near 78. |
| Friday Night |
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61. |
| Saturday |
Partly sunny, with a high near 84. |
| Saturday Night |
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. |
| Sunday |
Mostly sunny, with a high near 91. Windy. |
| Sunday Night |
Mostly clear, with a low around 72. Windy. |
| Monday |
Sunny, with a high near 93. Windy. |
Forecast from NOAA-NWS for Grinnell IA.