Big Arm Weather Forecast
- 55
- 75
Mostly Sunny
- 54
- 76
Mostly Sunny
- 54
- 77
Mostly Sunny
- 47
- 65
Chance Rain
- 48
- 65
Mostly Sunny
- 51
- 71
Mostly Sunny
Today 18 Sep Flathead/Mission Valleys
Mostly sunny. Highs in the mid 70s to lower 80s.
Tonight 18 Sep Flathead/Mission Valleys
Mostly clear. Lows in the mid 40s to lower 50s.
Big Arm Temperature Statistics
September Temperature
Kalispell, Glacier Park International Airport (34.8 miles)
Lowest 9 September, 2025
44.1 °FAverage September
66.1 °FHighest 2 September, 2025
93.2 °F
Climate (2020–Present)
Kalispell, Glacier Park International Airport (34.8 miles)
Average Low 2020–2025
33.1 °FAverage 2020–2025
45.2 °FAverage High 2020–2025
56.8 °F