Castle Lake Weather Forecast

    • 62
    • 78

    Mostly Sunny

    • 59
    • 76

    Partly Sunny

    • 52
    • 65

    Partly Sunny

    • 53
    • 65

    Mostly Sunny

    • 56
    • 71

    Sunny

    • 58
    • 74

    Sunny

Today 17 Jun South Central Siskiyou County

Sunny until early afternoon then becoming partly cloudy. Highs in the mid 80s to mid 90s. Northeast Winds around 5 Mph shifting to the south this afternoon.

Tonight 17 Jun South Central Siskiyou County

Partly cloudy. Lows in the mid 50s to lower 60s. Southwest Winds 5 to 10 Mph.

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Castle Lake Temperature Statistics

June Temperature

Mount Shasta (6.8 miles)

  • Lowest 7 June, 2026

    39.7 °F

  • Average June

    64.1 °F

  • Highest 15 June, 2026

    91.9 °F

Climate (2021–2026)

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

    66 °F
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