Castle Lake Weather Forecast

    • 54
    • 66

    Mostly Sunny

    • 46
    • 67

    Partly Sunny

    • 36
    • 57

    Partly Sunny

    • 44
    • 58

    Partly Sunny

    • 45
    • 58

    Mostly Cloudy

    • 41
    • 60

    Chance Rain Showers

Today 19 Mar South Central Siskiyou County

Sunny. Highs in the lower 70s to lower 80s. Northeast Winds around 5 Mph shifting to the southeast late this Morning, then shifting to the southwest this afternoon.

Tonight 19 Mar South Central Siskiyou County

Mostly clear. Lows in the mid 40s to mid 50s. West Winds around 5 Mph shifting to the north late in the evening and overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Lake Temperature Statistics

March Temperature

Mount Shasta (6.8 miles)

  • Lowest 11 March, 2026

    28.9 °F

  • Average March

    47.9 °F

  • Highest 16 March, 2026

    75.9 °F

Climate (2021–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    52.6 °F

  • Average High 2021–2026

    65.9 °F
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