Fountain Valley Weather Forecast

    • 64
    • 77

    Increasing Clouds

    • 66
    • 78

    Partly Sunny

    • 67
    • 81

    Partly Sunny

    • 68
    • 83

    Mostly Sunny

    • 69
    • 84

    Partly Sunny

    • 68
    • 87

    Partly Sunny

Today 21 Sep Orange County Inland

Mostly cloudy this morning. Becoming mostly sunny. Highs around 80. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 21 Sep Orange County Inland

Partly cloudy in the evening. Becoming mostly cloudy. Lows 57 to 64. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Fountain Valley Temperature Statistics

September Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 19 September, 2026

    64.9 °F

  • Average September

    76.9 °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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