San Joaquin Reservoir Weather Forecast

    • 68
    • 79

    Rain Showers Likely

    • 68
    • 79

    Rain Showers Likely

    • 68
    • 81

    Partly Sunny

    • 69
    • 82

    Partly Sunny

    • 69
    • 83

    Partly Sunny

    • 67
    • 81

    Partly Sunny

Today 5 Sep Orange County Coastal

Mostly sunny. Highs around 80 at the Beaches to 82 to 86 farther inland and near higher coastal Terrain. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 5 Sep Orange County Coastal

Mostly clear in the Evening, then mostly cloudy with a slight chance of Showers overnight. Lows around 70. Areas of Winds west 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Joaquin Reservoir Temperature Statistics

September Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 2 September, 2026

    64.9 °F

  • Average September

    72.8 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    73.8 °F
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