Big Arm State Park Weather Forecast

    • 47
    • 53

    Rain

    • 46
    • 55

    Rain

    • 46
    • 60

    Chance Rain

    • 50
    • 70

    Mostly Cloudy

    • 48
    • 68

    Chance Rain Showers

    • 50
    • 72

    Partly Sunny

Today 31 May Flathead/Mission Valleys

Rain likely. Chance of rain near 100 percent. Highs in the 50s.

Tonight 31 May Flathead/Mission Valleys

Rain likely. Patchy fog. Chance of rain near 100 percent. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm State Park Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 6 May, 2026

    29.6 °F

  • Average May

    53.9 °F

  • Highest 28 May, 2026

    88 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (33.6 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    45.6 °F

  • Average High 2021–2026

    57.2 °F
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