| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 1:26 pm CDT Sep 25, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| This Afternoon |
A 20 percent chance of showers. Mostly cloudy, with a high near 63. East southeast wind around 8 mph. |
| Tonight |
A 30 percent chance of showers after 3am. Mostly cloudy, with a low around 57. East southeast wind 5 to 7 mph. New precipitation amounts of less than a tenth of an inch possible. |
| Saturday |
Showers, mainly before 3pm. High near 59. Southeast wind 7 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible. |
| Saturday Night |
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 57. Southeast wind 6 to 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
| Sunday |
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 64. East southeast wind 3 to 5 mph. New precipitation amounts of less than a tenth of an inch possible. |
| Sunday Night |
Mostly cloudy, with a low around 57. |
| Monday |
Partly sunny, with a high near 68. |
| Monday Night |
Partly cloudy, with a low around 56. |
| Tuesday |
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%. |
| Tuesday Night |
Showers likely and possibly a thunderstorm, then showers after 1am. Low around 61. Chance of precipitation is 80%. |
| Wednesday |
Showers likely. Cloudy, with a high near 67. Chance of precipitation is 60%. |
| Wednesday Night |
A 50 percent chance of showers. Mostly cloudy, with a low around 58. |
| Thursday |
A 40 percent chance of showers. Mostly cloudy, with a high near 67. |
Forecast from NOAA-NWS for Grinnell IA.