Polson Bay Weather Forecast

    • 47
    • 78

    Increasing Clouds

    • 46
    • 78

    Mostly Cloudy

    • 46
    • 75

    Partly Sunny

    • 47
    • 74

    Mostly Cloudy

    • 42
    • 69

    Chance Rain

    • 39
    • 57

    Slight Chance Rain

Today 21 Sep Flathead/Mission Valleys

Mostly sunny. Patchy fog in the morning. Highs in the 70s.

Tonight 21 Sep Flathead/Mission Valleys

Mostly clear. Lows in the 40s to lower 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Polson Bay Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (41.6 miles)

  • Lowest 17 September, 2026

    38.6 °F

  • Average September

    56.9 °F

  • Highest 1 September, 2026

    84.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (41.6 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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