O'Neill Lake Weather Forecast

    • 48
    • 71

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 52
    • 74

    Mostly Sunny

    • 55
    • 79

    Mostly Sunny

    • 55
    • 81

    Mostly Sunny

    • 54
    • 79

    Sunny

Today 5 Dec San Diego County Inland Valleys

Mostly sunny. Highs 68 to 73. Light Winds.

Tonight 5 Dec San Diego County Inland Valleys

Clear. Lows 41 to 47 in wind Sheltered Areas to 45 to 50 in warmer Locations. Light Winds.

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O'Neill Lake Temperature Statistics

December Temperature

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

  • Lowest 1 December, 2025

    48 °F

  • Average December

    59.4 °F

  • Highest 1 December, 2025

    68 °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

    63.8 °F

  • Average High 2020–2025

    73.7 °F
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