Castle Lake Weather Forecast

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    Mostly Sunny

Today 15 Sep South Central Siskiyou County

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

Tonight 15 Sep South Central Siskiyou County

Partly cloudy then becoming mostly clear late this evening then becoming partly cloudy then becoming mostly clear well after midnight. A 10 percent chance of rain after midnight. Lows in the mid 30s to mid 40s. West Winds 5 to 10 Mph shifting to the north late this evening and overnight.

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Castle Lake Temperature Statistics

September Temperature

Mount Shasta (6.8 miles)

  • Lowest 4 September, 2026

    33.7 °F

  • Average September

    58.1 °F

  • Highest 9 September, 2026

    90.6 °F

Climate (2021–2026)

Mount Shasta (6.8 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    65.7 °F
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