Costich Lake Weather Forecast

    • 41
    • 71

    Increasing Clouds

    • 44
    • 75

    Partly Sunny

    • 46
    • 78

    Partly Sunny

    • 47
    • 77

    Partly Sunny

    • 44
    • 72

    Chance Rain

    • 43
    • 68

    Chance Rain

Today 21 May Kootenai/Cabinet Region

Mostly sunny. Highs in the upper 60s to mid 70s.

Tonight 21 May Kootenai/Cabinet Region

Mostly cloudy. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Costich Lake Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (52.8 miles)

  • Lowest 6 May, 2026

    29.6 °F

  • Average May

    51.9 °F

  • Highest 12 May, 2026

    76.6 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (52.8 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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