Fountain Valley Weather Forecast

    • 60
    • 75

    Decreasing Clouds

    • 60
    • 74

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 60
    • 75

    Partly Sunny

    • 60
    • 74

    Partly Sunny

Today 31 May Orange County Inland

Partly cloudy in the morning. Becoming mostly sunny. Highs 76 to 79 towards the coast to 80 to 83 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 31 May Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 55 to 61. Areas of Winds southwest 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fountain Valley Temperature Statistics

May Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 6 May, 2026

    56.6 °F

  • Average May

    66.2 °F

  • Highest 20 May, 2026

    82.7 °F

Climate (2021–Present)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    66 °F

  • Average High 2021–2026

    73.7 °F
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