Walnut Weather Forecast

    • 67
    • 89

    Mostly Sunny

    • 66
    • 82

    Partly Sunny

    • 61
    • 76

    Partly Sunny

Today 9 Oct Orange County Inland

Partly cloudy in the morning. Becoming sunny. Highs 84 to 87 towards the coast to 90 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 9 Oct Orange County Inland

Mostly clear in the evening. Becoming mostly cloudy. Lows 62 to 67. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Walnut Temperature Statistics

October Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 1 October, 2026

    67.6 °F

  • Average October

    83.9 °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

    59.1 °F

  • Average 2021–2026

    66.2 °F

  • Average High 2021–2026

    73.8 °F
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