Diamond Bar Weather Forecast

    • 43
    • 56

    Mostly Sunny

    • 46
    • 67

    Partly Cloudy

    • 49
    • 72

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

    • 54
    • 76

    Partly Sunny

    • 55
    • 76

    Partly Sunny

    • 56
    • 78

    Partly Sunny

Today 20 Feb Los Angeles County San Gabriel Valley

Partly cloudy. Highs in the mid 50s to lower 60s.

Tonight 20 Feb Los Angeles County San Gabriel Valley

Mostly clear. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

February Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 18 February, 2026

    44.6 °F

  • Average February

    62.4 °F

  • Highest 4 February, 2026

    84.2 °F

Climate (2021–Present)

Brackett Field Airport (4.3 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    67.8 °F

  • Average High 2021–2026

    75.7 °F
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