The Arboretum Weather Forecast

    • 65
    • 84

    Mostly Sunny

    • 68
    • 94

    Mostly Sunny

    • 68
    • 93

    Mostly Sunny

    • 68
    • 92

    Partly Sunny

    • 67
    • 91

    Partly Sunny

    • 64
    • 86

    Partly Sunny

    • 63
    • 83

    Mostly Sunny

Today 22 Sep Los Angeles County San Gabriel Valley

Sunny. Highs in the mid 80s.

Tonight 22 Sep Los Angeles County San Gabriel Valley

Mostly clear. Lows in the lower to mid 60s.

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The Arboretum Temperature Statistics

September Temperature

El Monte (4.3 miles)

  • Lowest 2 September, 2026

    64.4 °F

  • Average September

    81 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

El Monte (4.3 miles)

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  • Average Low 2021–2026

    60 °F

  • Average 2021–2026

    70.7 °F

  • Average High 2021–2026

    77.3 °F
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