Big Arm Weather Forecast

    • 36
    • 54

    Rain/Snow Likely

    • 40
    • 60

    Mostly Sunny

    • 42
    • 62

    Chance Rain Showers

    • 44
    • 64

    Chance Rain

    • 46
    • 68

    Partly Sunny

    • 46
    • 69

    Slight Chance Thunderstorms

Today 17 May Flathead/Mission Valleys

Cloudy with a chance of snow and a slight chance of rain in the Morning, then partly cloudy in the afternoon. Chance of precipitation 50 percent. Highs in the 50s. North Winds to 15 Mph.

Tonight 17 May Flathead/Mission Valleys

Mostly clear. Widespread frost after midnight. Lows in the mid 20s to lower 30s.

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Big Arm Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 6 May, 2026

    29.6 °F

  • Average May

    54 °F

  • Highest 12 May, 2026

    76.6 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    57.2 °F
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