Grinnell Weather Forecast
- 50
- 75
Becoming Sunny
- 58
- 82
Slight Chance Thunderstorms
- 57
- 80
Slight Chance Thunderstorms
- 58
- 85
Mostly Sunny
- 53
- 83
Slight Chance Thunderstorms
- 51
- 74
Partly Sunny
- 50
- 76
Mostly Sunny
Today 18 Sep Gove
Partly cloudy. Near steady temperature in the mid 70s. Northwest Winds around 5 Mph.
Tonight 18 Sep Gove
Clear. Lows in the lower 50s. North Winds around 5 Mph, becoming west after midnight.
Grinnell Temperature Statistics
September Temperature
Hill City, Hill City Municipal Airport (46 miles)
Lowest 6 September, 2025
44.1 °FAverage September
70.1 °FHighest 12 September, 2025
96.1 °F
Climate (2020–Present)
Hill City, Hill City Municipal Airport (46 miles)
Average Low 2020–2025
41.8 °FAverage 2020–2025
55.6 °FAverage High 2020–2025
69.9 °F