Fountain Valley Weather Forecast

    • 73
    • 99

    Hot

    • 72
    • 94

    Sunny

    • 70
    • 91

    Mostly Sunny

    • 70
    • 91

    Mostly Sunny

    • 69
    • 86

    Mostly Sunny

    • 67
    • 82

    Partly Sunny

Today 5 Oct Orange County Inland

Sunny, hot. Highs 99 to 103. Areas of Winds northwest to 10 Mph.

Tonight 5 Oct Orange County Inland

Mostly clear. Lows 71 to 74. Areas of Winds north to 10 Mph in the evening becoming light.

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Fountain Valley Temperature Statistics

October Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 2 October, 2026

    66.9 °F

  • Average October

    80.7 °F

  • Highest 3 October, 2026

    100.9 °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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