The Arboretum Weather Forecast

    • 60
    • 88

    Mostly Sunny

    • 64
    • 93

    Mostly Sunny

    • 71
    • 97

    Hot

    • 72
    • 100

    Hot

    • 72
    • 99

    Hot

    • 71
    • 98

    Hot

Today 30 Sep Los Angeles County San Gabriel Valley

Areas of low Clouds and fog in the morning then sunny. Highs in the mid 80s to around 90.

Tonight 30 Sep Los Angeles County San Gabriel Valley

Mostly clear in the evening then partly cloudy. Lows in the upper 50s 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

    80.7 °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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