John Zimmerman Park Weather Forecast

    • 74
    • 104

    Hot

    • 71
    • 96

    Mostly Sunny

    • 68
    • 91

    Partly Sunny

    • 66
    • 85

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

Today 9 Sep Los Angeles County Inland Coast including Downtown Los Angeles

Sunny. Highs 93 to 103.

Tonight 9 Sep Los Angeles County Inland Coast including Downtown Los Angeles

Mostly clear in the evening then partly cloudy. Lows in the lower to mid 70s.

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John Zimmerman 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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