Diamond Bar Weather Forecast

    • 58
    • 75

    Decreasing Clouds

    • 55
    • 74

    Mostly Cloudy

    • 55
    • 74

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

    • 58
    • 81

    Partly Sunny

    • 59
    • 84

    Partly Sunny

Today 29 Jun Los Angeles County San Gabriel Valley

Cloudy in the morning then sunny. Patchy drizzle in the morning. Highs in the mid 70s.

Tonight 29 Jun Los Angeles County San Gabriel Valley

Mostly cloudy. Lows in the mid 50s to lower 60s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

June Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 3 June, 2026

    57.2 °F

  • Average June

    73.7 °F

  • Highest 12 June, 2026

    93.2 °F

Climate (2021–2026)

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

    75.9 °F
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