Polson Bay Weather Forecast
- 40
- 77
Chance Rain
- 34
- 59
Partly Sunny
- 37
- 62
Partly Sunny
- 39
- 67
Mostly Sunny
- 42
- 65
Slight Chance Rain
- 41
- 66
Partly Sunny
- 40
- 64
Mostly Cloudy
Today 25 Sep Flathead/Mission Valleys
Mostly cloudy with a 30 percent chance of rain. Highs in the mid 50s to lower 60s.
Tonight 25 Sep Flathead/Mission Valleys
Mostly cloudy then becoming partly cloudy late in the evening then becoming mostly cloudy then becoming partly cloudy late in the night. A 50 percent chance of Areas of rain until early morning. Lows in the upper 30s to mid 40s. Windy with south Winds 20 to 30 Mph.
Polson Bay Temperature Statistics
September Temperature
Kalispell, Glacier Park International Airport (41.6 miles)
Lowest 17 September, 2026
38.6 °FAverage September
56.9 °FHighest 1 September, 2026
84.7 °F
Climate (2021–2026)
Kalispell, Glacier Park International Airport (41.6 miles)
Average Low 2021–2026
33.4 °FAverage 2021–2026
45.4 °FAverage High 2021–2026
57 °F