Leffingwell Ranch Park Weather Forecast

    • 80
    • 105

    Hot

    • 76
    • 96

    Mostly Sunny

    • 66
    • 90

    Mostly Sunny

    • 64
    • 85

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

    • 62
    • 84

    Mostly Sunny

Today 9 Sep Los Angeles County San Gabriel Valley

Sunny in the morning then partly cloudy. Highs 100 to 106.

Tonight 9 Sep Los Angeles County San Gabriel Valley

Mostly clear. Lows in the upper 70s to mid 80s.

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Leffingwell Ranch Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (4.3 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    76.2 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    66.6 °F

  • Average High 2021–2026

    76.9 °F
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