Big Arm Weather Forecast

    • 37
    • 52

    Rain/Snow Likely

    • 36
    • 53

    Rain/Snow Likely

    • 41
    • 60

    Partly Sunny

    • 42
    • 63

    Chance Rain Showers

    • 44
    • 64

    Partly Sunny

    • 48
    • 69

    Partly Sunny

Today 16 May Flathead/Mission Valleys

Rain likely in the Morning, then rain Showers likely and a slight chance of Thunderstorms in the afternoon. Chance of precipitation 70 percent. Highs in the upper 40s to mid 50s. Southwest Winds to 15 Mph in the afternoon.

Tonight 16 May Flathead/Mission Valleys

Mostly cloudy with a chance of rain. A chance of snow after midnight. Chance of precipitation 50 percent. Lows in the upper 20s to mid 30s.

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  • Temperature Forecast NOAA

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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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