Fountain Valley Weather Forecast

    • 69
    • 83

    Increasing Clouds

    • 69
    • 82

    Increasing Clouds

    • 68
    • 81

    Partly Sunny

    • 67
    • 80

    Partly Sunny

    • 67
    • 78

    Mostly Cloudy

    • 67
    • 78

    Partly Sunny

    • 66
    • 79

    Partly Sunny

Today 9 Aug Orange County Inland

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 84 to 87 towards the coast to 90 to 93 farther inland. Areas of Winds west to 10 Mph.

Tonight 9 Aug Orange County Inland

Partly cloudy. Patchy dense fog overnight. Lows 63 to 69. Areas of Winds southwest to 10 Mph this 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

    76 °F

  • Highest 2 August, 2026

    83.6 °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

    73.7 °F
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