Walnut Weather Forecast

    • 56
    • 71

    Becoming Sunny

    • 59
    • 77

    Sunny

    • 60
    • 81

    Mostly Sunny

    • 59
    • 82

    Mostly Sunny

    • 57
    • 79

    Partly Sunny

    • 58
    • 77

    Partly Sunny

Today 23 Oct Orange County Inland

Partly cloudy. A slight chance of Showers in the morning. Highs around 70. Light Winds. Chance of measurable precipitation 20 percent.

Tonight 23 Oct Orange County Inland

Partly cloudy in the evening. Becoming mostly clear. Lows 52 to 56. Light Winds.

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Walnut Temperature Statistics

October Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 13 October, 2026

    58.6 °F

  • Average October

    77.6 °F

  • Highest 3 October, 2026

    102.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2021–2026

    59.2 °F

  • Average 2021–2026

    66.3 °F

  • Average High 2021–2026

    73.9 °F
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