O'Neill Lake Weather Forecast

    • 66
    • 85

    Slight Chance Thunderstorms

    • 64
    • 84

    Patchy Fog

    • 63
    • 85

    Patchy Fog

    • 63
    • 85

    Patchy Fog

    • 63
    • 84

    Patchy Fog

    • 64
    • 84

    Partly Sunny

Today 25 Aug San Diego County Inland Valleys

Partly cloudy. A chance of Showers and a slight chance of Thunderstorms this afternoon. Highs 83 to 88 in the western Valleys to 89 to 94 near the Foothills. Areas of Winds west to 10 Mph. Chance of measurable precipitation 50 percent.

Tonight 25 Aug San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers this evening. Patchy fog overnight. Lows 62 to 66. Areas of Winds west to 10 Mph this evening becoming light. Chance of measurable precipitation 20 percent.

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O'Neill Lake Temperature Statistics

August Temperature

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

  • Lowest 6 August, 2025

    55.9 °F

  • Average August

    69.7 °F

  • Highest 7 August, 2025

    88 °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

    63.9 °F

  • Average High 2020–2025

    74 °F
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