Castle Lake Weather Forecast

    • 44
    • 59

    Sunny

    • 36
    • 50

    Mostly Sunny

    • 42
    • 57

    Mostly Sunny

    • 43
    • 57

    Partly Sunny

    • 42
    • 54

    Partly Sunny

    • 42
    • 52

    Mostly Cloudy

    • 40
    • 43

    Rain Likely

Today 18 Oct South Central Siskiyou County

Sunny. Highs in the mid 60s to mid 70s. Northeast Winds around 5 Mph shifting to the southwest late this afternoon.

Tonight 18 Oct South Central Siskiyou County

Clear. Lows in the mid 30s to mid 40s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Lake Temperature Statistics

October Temperature

Mount Shasta (6.8 miles)

  • Lowest 11 October, 2025

    30.9 °F

  • Average October

    48.8 °F

  • Highest 7 October, 2025

    73.9 °F

Climate (2020–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    65.5 °F
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