Altadena Weather Forecast

    • 64
    • 88

    Mostly Sunny

    • 65
    • 87

    Mostly Sunny

    • 69
    • 92

    Mostly Sunny

    • 72
    • 96

    Mostly Sunny

    • 73
    • 98

    Hot

    • 73
    • 97

    Hot

    • 71
    • 96

    Sunny

Today 29 Sep Los Angeles County San Gabriel Valley

Sunny. Highs 95 to 100.

Tonight 29 Sep Los Angeles County San Gabriel Valley

Mostly clear. Lows in the upper 50s to mid 60s.

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Altadena Temperature Statistics

September Temperature

El Monte (8.7 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 (8.7 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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