Fountain Valley Weather Forecast

    • 65
    • 81

    Increasing Clouds

    • 66
    • 80

    Partly Sunny

    • 66
    • 81

    Mostly Sunny

    • 67
    • 82

    Mostly Sunny

    • 67
    • 82

    Mostly Sunny

    • 69
    • 84

    Partly Sunny

Today 31 Aug Orange County Inland

Partly cloudy in the morning. Becoming sunny. Highs around 83 towards the coast to 87 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 31 Aug Orange County Inland

Clear in the evening. Becoming partly cloudy. Lows 58 to 65. Areas of Winds southwest 10 Mph in the evening becoming light.

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Fountain Valley Temperature Statistics

August Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 5 August, 2026

    68.6 °F

  • Average August

    77.9 °F

  • Highest 23 August, 2026

    93.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (5 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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