Castle Lake Weather Forecast

    • 50
    • 63

    Mostly Sunny

    • 51
    • 62

    Mostly Sunny

    • 48
    • 62

    Mostly Sunny

    • 53
    • 65

    Mostly Sunny

    • 53
    • 67

    Mostly Sunny

    • 56
    • 69

    Mostly Sunny

Today 6 May South Central Siskiyou County

Sunny. Highs in the lower 70s to lower 80s. Light Winds becoming south around 5 Mph in the late morning and early Afternoon, then shifting to the southwest late this afternoon.

Tonight 6 May South Central Siskiyou County

Mostly clear. Lows in the lower 40s to lower 50s. West Winds around 5 Mph until well after midnight becoming light.

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Castle Lake Temperature Statistics

May Temperature

Mount Shasta (6.8 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    57.7 °F

  • Highest 3 May, 2026

    77.6 °F

Climate (2021–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    65.9 °F
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