Boisseranc Park Weather Forecast

    • 71
    • 92

    Increasing Clouds

    • 68
    • 86

    Partly Sunny

    • 66
    • 81

    Mostly Sunny

    • 71
    • 89

    Mostly Sunny

    • 71
    • 91

    Mostly Sunny

    • 70
    • 91

    Partly Sunny

    • 71
    • 92

    Mostly Sunny

Today 26 Sep Orange County Inland

Mostly sunny. Highs around 90 towards the coast to 93 farther inland.

Tonight 26 Sep Orange County Inland

Mostly cloudy. Lows 66 to 70. Light Winds.

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Boisseranc Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (1.2 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    77.5 °F

  • Highest 9 September, 2026

    108.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (1.2 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    76.9 °F
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