| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 6:02 am CDT Aug 11, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| Today |
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 89. Light and variable wind becoming south southwest 5 to 7 mph in the morning. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Tonight |
A 20 percent chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 68. Northeast wind 3 to 5 mph. |
| Wednesday |
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 11am. Partly sunny, with a high near 87. East northeast wind around 6 mph becoming north northwest in the morning. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Wednesday Night |
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. East northeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible. |
| Thursday |
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 81. East northeast wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible. |
| Thursday Night |
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 64. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. |
| Friday |
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%. |
| Friday Night |
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%. |
| Saturday |
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 85. |
| Saturday Night |
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%. |
| Sunday |
Partly sunny, with a high near 80. |
| Sunday Night |
Partly cloudy, with a low around 62. |
| Monday |
Mostly sunny, with a high near 77. |
Forecast from NOAA-NWS for Grinnell IA.