Walnut Weather Forecast

    • 67
    • 84

    Mostly Cloudy

    • 65
    • 81

    Becoming Sunny

    • 66
    • 83

    Partly Sunny

    • 67
    • 85

    Partly Sunny

    • 67
    • 85

    Partly Sunny

    • 68
    • 86

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

Today 13 Aug Orange County Inland

Mostly cloudy this morning. Becoming partly cloudy. Highs 78 to 82. Areas of Winds south to 10 Mph.

Tonight 13 Aug Orange County Inland

Mostly cloudy. Patchy dense fog. Cooler. Lows 58 to 67. Areas of Winds southwest 10 Mph this evening becoming light.

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Walnut Temperature Statistics

August Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 5 August, 2026

    68.6 °F

  • Average August

    76.8 °F

  • Highest 9 August, 2026

    89.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    73.7 °F
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