O'Neill Lake Weather Forecast

    • 50
    • 71

    Partly Sunny

    • 49
    • 71

    Partly Sunny

    • 56
    • 81

    Mostly Sunny

    • 62
    • 97

    Sunny

    • 60
    • 98

    Mostly Sunny

    • 56
    • 91

    Mostly Sunny

    • 56
    • 89

    Sunny

Today 9 Mar San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers this afternoon. Highs around 71 in the western Valleys to 65 to 70 near the Foothills. Light Winds becoming west 10 to 15 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 9 Mar San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers this evening. Patchy fog overnight. Lows 41 to 51 in wind Sheltered Areas to 48 to 52 in warmer Locations. Areas of Winds west to 10 Mph this evening becoming light. Chance of measurable precipitation 20 percent.

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  • Temperature Forecast NOAA

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O'Neill Lake Temperature Statistics

March Temperature

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

  • Lowest 2 March, 2026

    46.9 °F

  • Average March

    62.4 °F

  • Highest 1 March, 2026

    80.1 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    64 °F

  • Average High 2021–2026

    73.8 °F
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