Diamond Bar Weather Forecast

    • 47
    • 66

    Mostly Sunny

    • 51
    • 75

    Mostly Sunny

    • 53
    • 74

    Partly Sunny

    • 53
    • 73

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 56
    • 82

    Partly Sunny

Today 27 Apr Los Angeles County San Gabriel Valley

Partly cloudy in the morning then sunny. Highs in the mid to upper 60s.

Tonight 27 Apr Los Angeles County San Gabriel Valley

Mostly clear. Lows in the mid 40s to around 50.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

April Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 3 April, 2026

    50 °F

  • Average April

    67.9 °F

  • Highest 4 April, 2026

    86 °F

Climate (2021–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    68.1 °F

  • Average High 2021–2026

    76 °F
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