Santa Ana River Mouth Weather Forecast

    • 67
    • 76

    Increasing Clouds

    • 65
    • 75

    Partly Sunny

    • 65
    • 74

    Patchy Fog

    • 65
    • 76

    Patchy Fog

    • 65
    • 74

    Patchy Fog

    • 65
    • 72

    Patchy Fog

Today 4 Sep Orange County Coastal

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 75 to 79 at the Beaches to 81 to 86 farther inland and near higher coastal Terrain. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 4 Sep Orange County Coastal

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 62 to 66. Areas of Winds southwest 10 to 15 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Santa Ana River Mouth Temperature Statistics

September Temperature

John Wayne-Orange County Airport (6.2 miles)

  • Lowest 1 September, 2025

    68 °F

  • Average September

    74.9 °F

  • Highest 2 September, 2025

    84.9 °F

Climate (2020–Present)

John Wayne-Orange County Airport (6.2 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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