| National Weather Service Forecast for:
Grinnell IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 5:13 pm CDT Jul 18, 2026 | ||||||||||||||||||
| Grinnell | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 64. Northeast wind 3 to 5 mph. |
| Sunday |
Patchy smoke. Sunny, with a high near 88. East southeast wind around 5 mph. |
| Sunday Night |
Patchy smoke before 1am. Partly cloudy, with a low around 67. East southeast wind 3 to 7 mph. |
| Monday |
A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. Heat index values as high as 105. South wind 7 to 9 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Monday Night |
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Partly cloudy, with a low around 70. South southwest wind 6 to 8 mph becoming west northwest after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible. |
| Tuesday |
Sunny, with a high near 85. Breezy. |
| Tuesday Night |
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 83. |
| Thursday Night |
Partly cloudy, with a low around 63. |
| Friday |
Partly sunny, with a high near 84. |
| Friday Night |
Partly cloudy, with a low around 64. |
| Saturday |
Sunny, with a high near 88. |
Forecast from NOAA-NWS for Grinnell IA.