Big Arm Weather Forecast

    • 49
    • 70

    Chance Thunderstorms

    • 48
    • 67

    Chance Rain

    • 50
    • 71

    Mostly Cloudy

    • 48
    • 70

    Mostly Sunny

    • 52
    • 76

    Partly Sunny

    • 50
    • 74

    Partly Sunny

    • 50
    • 74

    Partly Sunny

Today 6 May Flathead/Mission Valleys

Mostly sunny. Highs in the upper 60s to mid 70s. Southwest Winds to 15 Mph.

Tonight 6 May Flathead/Mission Valleys

Mostly cloudy until early morning then becoming partly cloudy. Chance of Showers and Thunderstorms until early Morning, then slight chance of rain late in the night. Chance of precipitation 50 percent. Lows in the 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 1 May, 2026

    30.7 °F

  • Average May

    54 °F

  • Highest 3 May, 2026

    73.7 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    57.2 °F
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