Copco Lake Weather Forecast

    • 43
    • 64

    Cloudy

    • 44
    • 70

    Mostly Cloudy

    • 44
    • 70

    Chance Rain

    • 37
    • 62

    Partly Sunny

    • 33
    • 57

    Mostly Sunny

    • 38
    • 60

    Chance Rain

Today 19 Oct North Central and Southeast Siskiyou County

Mostly cloudy. Highs in the mid 50s to mid 60s. Southwest Winds 10 to 20 Mph.

Tonight 19 Oct North Central and Southeast Siskiyou County

Cloudy. Lows in the lower 30s to lower 40s. Southwest Winds 10 to 15 Mph shifting to the east after midnight.

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  • Temperature Real-Time

Copco Lake Temperature Statistics

October Temperature

Montague Siskiyou County Airport (16.2 miles)

  • Lowest 13 October, 2026

    24.7 °F

  • Average October

    59.8 °F

  • Highest 7 October, 2026

    93.7 °F

Climate (2021–2026)

Montague Siskiyou County Airport (16.2 miles)

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  • Average Low 2021–2026

    39.2 °F

  • Average 2021–2026

    54 °F

  • Average High 2021–2026

    69.1 °F
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