Fountain Valley Weather Forecast

    • 50
    • 72

    Patchy Fog

    • 49
    • 73

    Increasing Clouds

    • 52
    • 69

    Mostly Cloudy

    • 51
    • 67

    Mostly Cloudy

    • 50
    • 67

    Partly Sunny

    • 49
    • 70

    Partly Sunny

    • 50
    • 72

    Partly Sunny

Today 19 Jan Orange County Inland

Mostly sunny. Highs around 74 towards the coast to 75 to 79 farther inland. Light Winds.

Tonight 19 Jan Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Local visibility one quarter mile or less at Times overnight. Lows 50 to 54. Areas of Winds east to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fountain Valley Temperature Statistics

January Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 8 January, 2026

    48 °F

  • Average January

    61.1 °F

  • Highest 14 January, 2026

    82 °F

Climate (2021–Present)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2021–2026

    58.8 °F

  • Average 2021–2026

    65.7 °F

  • Average High 2021–2026

    73.3 °F
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