Castle Lake Weather Forecast

    • 29
    • 36

    Rain

    • 33
    • 35

    Rain

    • 32
    • 37

    Rain/Snow

    • 33
    • 38

    Snow Likely

    • 31
    • 34

    Snow

    • 32
    • 32

    Snow Likely

Today 19 Dec South Central Siskiyou County

Rain. Snow level 7000 feet lowering to 6500 feet in the afternoon. Highs in the lower to mid 40s. South Winds 10 to 20 Mph. Chance of rain near 100 percent.

Tonight 19 Dec South Central Siskiyou County

Mostly cloudy. Rain and snow likely in the Evening, then chance of rain and snow after midnight. Snow level 5500 feet lowering to 4500 feet after midnight. Little or no snow accumulation. Lows in the lower to mid 30s. Southwest Winds 10 to 15 Mph. Chance of precipitation 60 percent.

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Castle Lake Temperature Statistics

December Temperature

Mount Shasta (6.8 miles)

  • Lowest 1 December, 2025

    27 °F

  • Average December

    41.3 °F

  • Highest 13 December, 2025

    64 °F

Climate (2020–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    65.6 °F
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