Newport Bay - Promontory Bay Weather Forecast

    • 69
    • 81

    Increasing Clouds

    • 70
    • 83

    Partly Sunny

    • 68
    • 80

    Partly Sunny

    • 67
    • 76

    Mostly Sunny

    • 70
    • 81

    Mostly Sunny

    • 69
    • 82

    Mostly Sunny

    • 69
    • 81

    Partly Sunny

Today 25 Sep Orange County Coastal

Partly cloudy in the morning. Becoming mostly sunny. Highs around 80 at the Beaches to 82 to 86 farther inland and near higher coastal Terrain.

Tonight 25 Sep Orange County Coastal

Mostly clear this evening. Becoming mostly cloudy. Lows 66 to 69. Areas of Winds west to 10 Mph this evening becoming light.

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Newport Bay - Promontory Bay Temperature Statistics

September Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    76.4 °F

  • Highest 9 September, 2026

    102.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2021–2026

    59.1 °F

  • Average 2021–2026

    66.2 °F

  • Average High 2021–2026

    73.8 °F
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