Fountain Valley Weather Forecast

    • 72
    • 87

    Mostly Sunny

    • 71
    • 89

    Mostly Sunny

    • 74
    • 88

    Mostly Sunny

    • 73
    • 90

    Partly Sunny

    • 73
    • 90

    Partly Sunny

    • 72
    • 89

    Mostly Sunny

Today 24 Aug Orange County Inland

Mostly sunny. Highs 88 to 92 towards the coast to 94 to 97 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 24 Aug Orange County Inland

Mostly clear. Patchy fog overnight. Local visibility one quarter mile or less at Times overnight. Lows 69 to 73. Areas of Winds south to 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

    76.6 °F

  • Highest 9 August, 2026

    89.7 °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

    73.7 °F
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