Diamond Bar Weather Forecast

    • 50
    • 78

    Mostly Cloudy

    • 48
    • 72

    Mostly Sunny

    • 48
    • 70

    Partly Sunny

    • 47
    • 64

    Partly Sunny

    • 48
    • 69

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

Today 27 Nov Los Angeles County San Gabriel Valley

Mostly cloudy. Highs in the mid 70s to around 80.

Tonight 27 Nov Los Angeles County San Gabriel Valley

Mostly cloudy in the evening then mostly clear. Lows in the upper 40s to mid 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

November Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 18 November, 2025

    44.6 °F

  • Average November

    63.8 °F

  • Highest 10 November, 2025

    91.4 °F

Climate (2020–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    67.6 °F

  • Average High 2020–2025

    75.5 °F
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