| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 12:13 pm CDT Jul 18, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| This Afternoon |
Mostly sunny, with a high near 91. Heat index values as high as 101. Northwest wind around 7 mph. |
| Tonight |
Mostly clear, with a low around 65. North northeast wind 5 to 8 mph becoming calm in the evening. |
| Sunday |
Patchy smoke. Sunny, with a high near 88. East wind 3 to 5 mph. |
| Sunday Night |
Patchy smoke before 1am. Mostly clear, with a low around 68. Calm wind becoming south southeast around 6 mph after midnight. |
| Monday |
Sunny, with a high near 95. Southwest wind 6 to 9 mph. |
| Monday Night |
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly clear, with a low around 70. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Tuesday |
Sunny, with a high near 85. Breezy. |
| Tuesday Night |
Mostly clear, with a low around 60. |
| Wednesday |
Sunny, with a high near 81. |
| Wednesday Night |
Partly cloudy, with a low around 59. |
| Thursday |
Mostly sunny, with a high near 82. |
| Thursday Night |
A 30 percent chance of showers. Partly cloudy, with a low around 62. |
| Friday |
Mostly sunny, with a high near 84. |
Forecast from NOAA-NWS for Grinnell IA.