Kalispell Weather Forecast

    • 35
    • 60

    Gradual Clearing

    • 38
    • 65

    Mostly Sunny

    • 45
    • 65

    Mostly Cloudy

    • 42
    • 65

    Slight Chance Rain

    • 43
    • 66

    Partly Sunny

    • 42
    • 65

    Partly Sunny

Today 27 Sep Flathead/Mission Valleys

Mostly cloudy. Highs in the mid 50s to lower 60s.

Tonight 27 Sep Flathead/Mission Valleys

Mostly cloudy in the evening then clearing. Lows in the 30s.

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Kalispell Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (7.5 miles)

  • Lowest 24 September, 2026

    37.9 °F

  • Average September

    56.8 °F

  • Highest 1 September, 2026

    84.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (7.5 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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