| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 3:16 am CDT May 20, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| Today |
Increasing clouds, with a high near 62. North northeast wind 7 to 9 mph. |
| Tonight |
Mostly cloudy, with a low around 44. East northeast wind 5 to 8 mph. |
| Thursday |
A slight chance of showers between 9am and noon. Mostly cloudy, with a high near 62. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. |
| Thursday Night |
A 50 percent chance of showers, mainly after 1am. Cloudy, with a low around 46. East wind around 11 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible. |
| Friday |
Showers likely. Mostly cloudy, with a high near 61. East wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible. |
| Friday Night |
A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 49. New precipitation amounts of less than a tenth of an inch possible. |
| Saturday |
Partly sunny, with a high near 71. |
| Saturday Night |
Mostly cloudy, with a low around 52. |
| Sunday |
Mostly sunny, with a high near 78. |
| Sunday Night |
Mostly clear, with a low around 54. |
| Memorial Day |
Mostly sunny, with a high near 82. |
| Monday Night |
Partly cloudy, with a low around 58. |
| Tuesday |
Mostly sunny, with a high near 85. |
Forecast from NOAA-NWS for Grinnell IA.