O'Neill Lake Weather Forecast

    • 50
    • 70

    Mostly Cloudy

    • 52
    • 68

    Chance Rain Showers

    • 50
    • 65

    Chance Rain Showers

    • 44
    • 67

    Slight Chance Rain Showers

    • 45
    • 69

    Partly Sunny

    • 46
    • 71

    Partly Sunny

    • 49
    • 73

    Partly Sunny

Today 21 Jan San Diego County Inland Valleys

Areas of fog this morning. Mostly cloudy. Local visibility one quarter mile or less at Times this morning. Highs 69 to 74. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 21 Jan San Diego County Inland Valleys

Mostly cloudy. Patchy fog. Lows 42 to 50 in wind Sheltered Areas to 48 to 53 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O'Neill Lake Temperature Statistics

January Temperature

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

  • Lowest 9 January, 2026

    43 °F

  • Average January

    62.3 °F

  • Highest 14 January, 2026

    84.9 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    54.1 °F

  • Average 2021–2026

    63.8 °F

  • Average High 2021–2026

    73.7 °F
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