Copco Lake Weather Forecast

    • 38
    • 74

    Sunny

    • 39
    • 70

    Partly Sunny

    • 35
    • 60

    Partly Sunny

    • 34
    • 62

    Mostly Sunny

    • 38
    • 71

    Sunny

    • 41
    • 77

    Sunny

Today 14 May North Central and Southeast Siskiyou County

Sunny. Highs in the mid 60s to mid 70s. Northeast Winds around 5 Mph shifting to the west 10 to 15 Mph with Gusts to around 30 Mph this afternoon.

Tonight 14 May North Central and Southeast Siskiyou County

Clear. Lows in the lower 30s to lower 40s. Northwest Winds 10 to 20 Mph with Gusts to around 35 Mph shifting to the north 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Copco Lake Temperature Statistics

May Temperature

Montague Siskiyou County Airport (16.2 miles)

  • Lowest 9 May, 2026

    36.6 °F

  • Average May

    63.6 °F

  • Highest 11 May, 2026

    88 °F

Climate (2021–Present)

Montague Siskiyou County Airport (16.2 miles)

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  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    69.2 °F
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