Castle Lake Weather Forecast

    • 57
    • 71

    Increasing Clouds

    • 57
    • 71

    Partly Sunny

    • 58
    • 73

    Mostly Sunny

    • 58
    • 73

    Mostly Sunny

    • 57
    • 71

    Partly Sunny

    • 54
    • 70

    Mostly Sunny

Today 16 Aug South Central Siskiyou County

Sunny until early afternoon then becoming partly cloudy. Highs in the mid 70s to mid 80s. Southeast Winds around 5 Mph shifting to the south this afternoon.

Tonight 16 Aug South Central Siskiyou County

Mostly cloudy. Lows in the mid 40s to mid 50s. South Winds around 5 Mph early in the evening becoming Light, then becoming northeast around 5 Mph after midnight.

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Castle Lake Temperature Statistics

August Temperature

Mount Shasta (6.8 miles)

  • Lowest 13 August, 2026

    49.6 °F

  • Average August

    72.9 °F

  • Highest 7 August, 2026

    98.7 °F

Climate (2021–2026)

Mount Shasta (6.8 miles)

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  • Average Low 2021–2026

    39.6 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    65.8 °F
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