Castle Lake Weather Forecast

    • 58
    • 74

    Areas Smoke

    • 61
    • 75

    Sunny

    • 60
    • 77

    Slight Chance Thunderstorms

    • 60
    • 74

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 57
    • 72

    Partly Sunny

Today 31 Aug South Central Siskiyou County

Partly cloudy early this morning then becoming sunny. Areas of smoke early this morning. Highs in the lower 80s to lower 90s. Northeast Winds 5 to 10 Mph shifting to the south this afternoon.

Tonight 31 Aug South Central Siskiyou County

Mostly clear. Areas of smoke. Lows in the mid 40s to mid 50s. South Winds 5 to 10 Mph shifting to the northeast well after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Lake Temperature Statistics

August Temperature

Mount Shasta (6.8 miles)

  • Lowest 19 August, 2025

    42.7 °F

  • Average August

    70 °F

  • Highest 11 August, 2025

    99.6 °F

Climate (2020–Present)

Mount Shasta (6.8 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    65.7 °F
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