| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 10:36 pm CDT Sep 1, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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Hazardous Weather Outlook
Heat Advisory
| Overnight |
Clear early, then becoming mostly cloudy, with a low around 73. South wind around 8 mph. |
| Wednesday |
Sunny, with a high near 92. South southwest wind 6 to 10 mph. |
| Wednesday Night |
Mostly clear, with a low around 74. South southwest wind 5 to 7 mph. |
| Thursday |
Mostly sunny, with a high near 91. South southwest wind 5 to 9 mph. |
| Thursday Night |
Mostly clear, with a low around 72. South southeast wind around 7 mph. |
| Friday |
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%. |
| Friday Night |
Mostly clear, with a low around 71. |
| Saturday |
Mostly sunny, with a high near 91. |
| Saturday Night |
Partly cloudy, with a low around 69. |
| Sunday |
A 40 percent chance of showers before 1pm. Mostly sunny, with a high near 87. |
| Sunday Night |
A 30 percent chance of showers. Partly cloudy, with a low around 67. |
| Labor Day |
Partly sunny, with a high near 83. |
| Monday Night |
Partly cloudy, with a low around 64. |
| Tuesday |
Mostly sunny, with a high near 84. |
Forecast from NOAA-NWS for Grinnell IA.