Castle Lake Weather Forecast

    • 35
    • 42

    Breezy

    • 37
    • 42

    Mostly Cloudy

    • 41
    • 45

    Mostly Cloudy

    • 40
    • 47

    Mostly Cloudy

    • 40
    • 48

    Partly Sunny

    • 40
    • 49

    Mostly Sunny

Today 6 Dec South Central Siskiyou County

Partly cloudy. Highs in the mid 40s to mid 50s. North Winds 5 to 10 Mph.

Tonight 6 Dec South Central Siskiyou County

Partly cloudy. Patchy fog. Lows in the lower to mid 30s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

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Castle Lake Temperature Statistics

December Temperature

Mount Shasta (6.8 miles)

  • Lowest 1 December, 2025

    27 °F

  • Average December

    37.2 °F

  • Highest 1 December, 2025

    51.1 °F

Climate (2020–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    65.5 °F
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