Diamond Bar Weather Forecast

    • 60
    • 87

    Mostly Sunny

    • 59
    • 85

    Mostly Sunny

    • 58
    • 79

    Mostly Sunny

    • 57
    • 78

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 55
    • 77

    Mostly Sunny

Today 15 Jun Los Angeles County San Gabriel Valley

Sunny. Highs in the mid to upper 80s.

Tonight 15 Jun Los Angeles County San Gabriel Valley

Mostly clear in the evening then partly cloudy. Lows in the upper 50s to mid 60s.

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  • Temperature Real-Time

Diamond Bar Temperature Statistics

June Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 3 June, 2026

    57.2 °F

  • Average June

    74.6 °F

  • Highest 12 June, 2026

    93.2 °F

Climate (2021–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    76 °F
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