O'Neill Lake Weather Forecast

    • 57
    • 84

    Mostly Sunny

    • 56
    • 82

    Mostly Sunny

    • 57
    • 82

    Partly Sunny

    • 56
    • 77

    Partly Sunny

    • 54
    • 72

    Partly Sunny

    • 56
    • 76

    Partly Sunny

Today 18 Oct San Diego County Inland Valleys

Mostly sunny. Highs 81 to 86. Areas of Winds east to 10 Mph becoming west 10 Mph this afternoon.

Tonight 18 Oct San Diego County Inland Valleys

Mostly clear. Lows 50 to 56. Light Winds.

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O'Neill Lake Temperature Statistics

October Temperature

Oceanside, Camp Pendleton, Marine Corps Air Station (2.5 miles)

  • Lowest 16 October, 2025

    46 °F

  • Average October

    64.1 °F

  • Highest 10 October, 2025

    80.1 °F

Climate (2020–Present)

Oceanside, Camp Pendleton, Marine Corps Air Station (2.5 miles)

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  • Average Low 2020–2025

    53.9 °F

  • Average 2020–2025

    63.7 °F

  • Average High 2020–2025

    73.8 °F
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