San Dimas Weather Forecast

    • 65
    • 90

    Chance Rain Showers

    • 64
    • 82

    Chance Thunderstorms

    • 65
    • 83

    Slight Chance Thunderstorms

    • 65
    • 85

    Partly Sunny

    • 67
    • 87

    Slight Chance Rain Showers

    • 68
    • 89

    Mostly Sunny

Today 17 Sep Los Angeles County San Gabriel Valley

Mostly cloudy. Highs in the lower 90s.

Tonight 17 Sep Los Angeles County San Gabriel Valley

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the 60s to lower 70s. Chance of precipitation 40 percent.

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San Dimas Temperature Statistics

September Temperature

Brackett Field Airport (1.9 miles)

  • Lowest 9 September, 2025

    59 °F

  • Average September

    80.9 °F

  • Highest 2 September, 2025

    102.2 °F

Climate (2020–Present)

Brackett Field Airport (1.9 miles)

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  • Average Low 2020–2025

    55.6 °F

  • Average 2020–2025

    67.8 °F

  • Average High 2020–2025

    75.7 °F
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