Grinnell Weather Forecast
- 40
- 69
Sunny
- 54
- 70
Chance Rain Showers
- 44
- 76
Partly Sunny
- 51
- 69
Partly Sunny
- 57
- 74
Slight Chance Thunderstorms
- 55
- 76
Partly Sunny
- 57
- 74
Slight Chance Rain Showers
Today 8 Oct Poweshiek
Sunny. Highs in the upper 60s. East Winds around 5 Mph.
Tonight 8 Oct Poweshiek
Clear. Lows around 40. East Winds 5 to 10 Mph.
Grinnell Temperature Statistics
October Temperature
Newton Municipal Airport - Earl Johnson Field (15.5 miles)
Lowest 6 October, 2025
55.4 °FAverage October
70.4 °FHighest 2 October, 2025
87.8 °F
Climate (2020–Present)
Newton Municipal Airport - Earl Johnson Field (15.5 miles)
Average Low 2020–2025
41.4 °FAverage 2020–2025
51.2 °FAverage High 2020–2025
61.1 °F