San Dimas Weather Forecast

    • 68
    • 93

    Partly Sunny

    • 68
    • 96

    Becoming Sunny

    • 68
    • 97

    Hot

    • 68
    • 93

    Mostly Sunny

    • 68
    • 94

    Mostly Sunny

    • 67
    • 93

    Mostly Sunny

    • 67
    • 93

    Mostly Sunny

Today 18 Aug Los Angeles County San Gabriel Valley

Partly cloudy in the morning then sunny. Highs 92 to 100.

Tonight 18 Aug Los Angeles County San Gabriel Valley

Partly cloudy. Lows in the mid to upper 60s.

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San Dimas Temperature Statistics

August Temperature

Brackett Field Airport (1.9 miles)

  • Lowest 4 August, 2026

    64.4 °F

  • Average August

    80.8 °F

  • Highest 8 August, 2026

    98.6 °F

Climate (2021–2026)

Brackett Field Airport (1.9 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    68 °F

  • Average High 2021–2026

    75.9 °F
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