Walnut Weather Forecast

    • 52
    • 68

    Increasing Clouds

    • 45
    • 66

    Partly Sunny

    • 47
    • 69

    Mostly Cloudy

    • 47
    • 71

    Partly Sunny

    • 50
    • 72

    Partly Sunny

    • 50
    • 73

    Mostly Cloudy

Today 23 Jan Orange County Inland

Partly cloudy. Highs 65 to 68. Light Winds becoming west 10 Mph this afternoon.

Tonight 23 Jan Orange County Inland

Partly cloudy in the evening. Becoming mostly cloudy. Lows around 51. Areas of Winds west 10 Mph in the evening becoming light.

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Walnut Temperature Statistics

January Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 8 January, 2026

    48 °F

  • Average January

    60.7 °F

  • Highest 14 January, 2026

    82 °F

Climate (2021–Present)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2021–2026

    58.8 °F

  • Average 2021–2026

    65.7 °F

  • Average High 2021–2026

    73.3 °F
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