Walnut Weather Forecast

    • 49
    • 71

    Increasing Clouds

    • 52
    • 72

    Mostly Cloudy

    • 55
    • 66

    Rain Showers

    • 52
    • 62

    Rain Showers

    • 51
    • 62

    Rain Showers

    • 46
    • 61

    Rain Showers

    • 45
    • 62

    Chance Rain Showers

Today 21 Dec Los Angeles County San Gabriel Valley

Mostly cloudy in the morning then sunny. Highs around 70.

Tonight 21 Dec Los Angeles County San Gabriel Valley

Mostly clear in the evening then low Clouds and fog. Lows in the upper 40s to mid 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Walnut Temperature Statistics

December Temperature

Brackett Field Airport (6.8 miles)

  • Lowest 5 December, 2025

    42.8 °F

  • Average December

    64.1 °F

  • Highest 10 December, 2025

    86 °F

Climate (2020–Present)

Brackett Field Airport (6.8 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    67.6 °F

  • Average High 2020–2025

    75.6 °F
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