Castle Lake Weather Forecast

    • 47
    • 64

    Sunny

    • 48
    • 67

    Mostly Sunny

    • 46
    • 63

    Mostly Sunny

    • 37
    • 57

    Mostly Sunny

    • 34
    • 44

    Partly Sunny

    • 34
    • 42

    Mostly Sunny

    • 33
    • 45

    Mostly Sunny

Today 15 Oct South Central Siskiyou County

Mostly clear. Slight chance of rain. Lows in the mid 20s to mid 30s. Highs in the lower 50s to lower 60s.

Tonight 15 Oct South Central Siskiyou County

Clear. Lows in the lower 40s to lower 50s. East Winds 5 to 10 Mph.

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Castle Lake Temperature Statistics

October Temperature

Mount Shasta (6.8 miles)

  • Lowest 13 October, 2026

    28.9 °F

  • Average October

    61.2 °F

  • Highest 8 October, 2026

    91.7 °F

Climate (2021–2026)

Mount Shasta (6.8 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    65.9 °F
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