Fountain Valley Weather Forecast

    • 52
    • 63

    Mostly Cloudy

    • 51
    • 65

    Mostly Cloudy

    • 49
    • 66

    Partly Sunny

    • 48
    • 66

    Mostly Sunny

    • 49
    • 68

    Mostly Sunny

    • 49
    • 71

    Mostly Sunny

Today 5 Jan Orange County Inland

Partly cloudy with a slight chance of Showers. Highs 61 to 64. Light Winds. Chance of measurable precipitation 20 percent.

Tonight 5 Jan Orange County Inland

Partly cloudy with a slight chance of Showers in the Evening, then mostly cloudy overnight. Lows 48 to 52. Light Winds becoming east 10 Mph overnight. Chance of measurable precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fountain Valley Temperature Statistics

January Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 1 January, 2026

    57 °F

  • Average January

    62.3 °F

  • Highest 2 January, 2026

    68 °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

    65.6 °F

  • Average High 2021–2026

    73.3 °F
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