Diamond Bar Weather Forecast

    • 58
    • 93

    Increasing Clouds

    • 54
    • 78

    Patchy Fog

    • 53
    • 77

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

Today 11 May Los Angeles County San Gabriel Valley

Sunny except for patchy low Clouds and fog in the morning. Highs in the mid 80s to mid 90s.

Tonight 11 May Los Angeles County San Gabriel Valley

Mostly clear. Lows in the upper 50s to mid 60s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

May Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 6 May, 2026

    51.8 °F

  • Average May

    66.6 °F

  • Highest 9 May, 2026

    82.4 °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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