Diamond Bar Weather Forecast

    • 59
    • 82

    Patchy Fog

    • 60
    • 86

    Patchy Fog

    • 59
    • 88

    Patchy Fog

    • 61
    • 88

    Patchy Fog

    • 63
    • 89

    Mostly Sunny

    • 67
    • 94

    Partly Sunny

    • 67
    • 98

    Hot

Today 3 Jul Los Angeles County San Gabriel Valley

Low Clouds and fog in the morning then sunny. Highs in the upper 70s to mid 80s.

Tonight 3 Jul Los Angeles County San Gabriel Valley

Mostly clear in the evening then low Clouds and fog. Lows in the mid 50s to mid 60s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

July Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 1 July, 2025

    59 °F

  • Average July

    78.9 °F

  • Highest 1 July, 2025

    87.8 °F

Climate (2020–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2020–2025

    55.7 °F

  • Average 2020–2025

    67.8 °F

  • Average High 2020–2025

    75.7 °F
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