Diamond Bar Weather Forecast

    • 64
    • 92

    Decreasing Clouds

    • 63
    • 88

    Partly Sunny

    • 62
    • 85

    Patchy Fog

    • 61
    • 81

    Partly Sunny

    • 61
    • 83

    Partly Sunny

    • 62
    • 85

    Partly Sunny

    • 62
    • 86

    Partly Sunny

Today 10 Aug Los Angeles County San Gabriel Valley

Sunny. Highs in the upper 80s to mid 90s. Southwest Winds around 15 Mph in the afternoon.

Tonight 10 Aug Los Angeles County San Gabriel Valley

Mostly cloudy in the evening then partly cloudy. Lows in the mid to upper 60s. Southwest Winds around 15 Mph in the evening.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Bar Temperature Statistics

August Temperature

Brackett Field Airport (4.3 miles)

  • Lowest 4 August, 2026

    64.4 °F

  • Average August

    81.7 °F

  • Highest 8 August, 2026

    98.6 °F

Climate (2021–2026)

Brackett Field Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    75.9 °F
Get WillyWeather+ to remove ads