Walnut Weather Forecast

    • 49
    • 74

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 54
    • 82

    Sunny

    • 53
    • 81

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

Today 7 Dec Orange County Inland

Mostly sunny. Highs around 72 towards the coast to 73 to 76 farther inland. Light Winds.

Tonight 7 Dec Orange County Inland

Mostly clear. Lows 49 to 52. Light Winds.

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  • Temperature Real-Time

Walnut Temperature Statistics

December Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 5 December, 2025

    48.9 °F

  • Average December

    60.1 °F

  • Highest 4 December, 2025

    71.1 °F

Climate (2020–Present)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.6 °F

  • Average High 2020–2025

    73.4 °F
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