Diamond Bar Weather Forecast

    • 63
    • 90

    Sunny

    • 58
    • 92

    Partly Sunny

    • 57
    • 81

    Mostly Cloudy

    • 56
    • 75

    Slight Chance Rain

    • 53
    • 72

    Partly Sunny

    • 51
    • 72

    Partly Sunny

Today 28 Mar Los Angeles County San Gabriel Valley

Areas of low Clouds and fog in the morning then sunny. Highs in the mid 80s to lower 90s.

Tonight 28 Mar Los Angeles County San Gabriel Valley

Clear. Lows in the lower to mid 60s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

March Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 3 March, 2026

    48.2 °F

  • Average March

    72.1 °F

  • Highest 19 March, 2026

    96.8 °F

Climate (2021–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    76 °F
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