Big Arm Weather Forecast

    • 43
    • 62

    Chance Rain

    • 42
    • 61

    Rain Likely

    • 46
    • 65

    Partly Sunny

    • 48
    • 69

    Partly Sunny

    • 48
    • 72

    Partly Sunny

    • 50
    • 72

    Partly Sunny

Today 19 May Flathead/Mission Valleys

Mostly cloudy. Areas of frost early in the morning. A 50 percent chance of Showers and Thunderstorms in the afternoon. Highs in the upper 50s to mid 60s. Southwest Winds to 15 Mph.

Tonight 19 May Flathead/Mission Valleys

Mostly cloudy. A 30 percent chance of rain in the evening. Lows in the mid 30s to lower 40s.

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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

    52.4 °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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