Castle Lake Weather Forecast

    • 40
    • 55

    Mostly Sunny

    • 45
    • 59

    Mostly Sunny

    • 52
    • 64

    Mostly Sunny

    • 52
    • 68

    Mostly Sunny

    • 52
    • 67

    Mostly Sunny

    • 50
    • 66

    Mostly Sunny

Today 18 May South Central Siskiyou County

Sunny. Highs in the lower 60s to lower 70s. North Winds 5 to 10 Mph.

Tonight 18 May South Central Siskiyou County

Clear. Lows in the lower 30s to lower 40s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

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Castle Lake Temperature Statistics

May Temperature

Mount Shasta (6.8 miles)

  • Lowest 14 May, 2026

    39.7 °F

  • Average May

    61.1 °F

  • Highest 11 May, 2026

    86.6 °F

Climate (2021–Present)

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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