O'Neill Lake Weather Forecast

    • 51
    • 68

    Chance Rain Showers

    • 48
    • 69

    Mostly Sunny

    • 51
    • 74

    Partly Sunny

    • 53
    • 76

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 53
    • 77

    Mostly Sunny

Today 26 Apr San Diego County Inland Valleys

Mostly cloudy with a chance of Showers in the Morning, then partly cloudy with a slight chance of Showers in the afternoon. Highs 65 to 68 in the western Valleys to 56 to 61 near the Foothills. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph. Chance of measurable precipitation 50 percent.

Tonight 26 Apr San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers overnight. Lows 45 to 52. Areas of Winds west 10 to 15 Mph. Gusts to 25 Mph in the evening. Chance of measurable precipitation 20 percent.

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O'Neill Lake Temperature Statistics

April Temperature

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

  • Lowest 3 April, 2026

    46.9 °F

  • Average April

    63 °F

  • Highest 4 April, 2026

    86 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    64.1 °F

  • Average High 2021–2026

    74 °F
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