Whittier Narrows Dam County Recreational Area Weather Forecast

    • 62
    • 83

    Increasing Clouds

    • 62
    • 82

    Mostly Cloudy

    • 62
    • 82

    Mostly Sunny

    • 63
    • 84

    Sunny

    • 64
    • 86

    Mostly Sunny

    • 62
    • 85

    Mostly Sunny

    • 62
    • 82

    Mostly Sunny

Today 15 Sep Los Angeles County San Gabriel Valley

Cloudy in the morning then partly cloudy. Highs in the lower to mid 80s.

Tonight 15 Sep Los Angeles County San Gabriel Valley

Low Clouds and fog developing. Patchy drizzle after midnight. Lows in the upper 50s to mid 60s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Whittier Narrows Dam County Recreational Area Temperature Statistics

September Temperature

El Monte (3.1 miles)

  • Lowest 2 September, 2026

    64.4 °F

  • Average September

    83.3 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

El Monte (3.1 miles)

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  • Average Low 2021–2026

    59.9 °F

  • Average 2021–2026

    70.7 °F

  • Average High 2021–2026

    77.3 °F
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