San Joaquin Marsh Weather Forecast

    • 64
    • 83

    Becoming Sunny

    • 65
    • 83

    Mostly Sunny

    • 64
    • 85

    Partly Sunny

    • 64
    • 82

    Patchy Fog

    • 63
    • 79

    Patchy Fog

    • 62
    • 77

    Patchy Fog

Today 5 Sep Orange County Coastal

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 74 to 77 at the Beaches to 79 to 84 farther inland and near higher coastal Terrain. Light Winds becoming southwest 10 to 15 Mph this afternoon.

Tonight 5 Sep Orange County Coastal

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 61 to 64. Areas of Winds southwest 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Joaquin Marsh Temperature Statistics

September Temperature

John Wayne-Orange County Airport (1.2 miles)

  • Lowest 1 September, 2025

    68 °F

  • Average September

    76.6 °F

  • Highest 3 September, 2025

    86 °F

Climate (2020–Present)

John Wayne-Orange County Airport (1.2 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.7 °F

  • Average High 2020–2025

    73.6 °F
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