Convention Center Weather Forecast

    • 68
    • 87

    Increasing Clouds

    • 69
    • 88

    Becoming Sunny

    • 70
    • 90

    Partly Sunny

    • 71
    • 91

    Partly Sunny

    • 68
    • 86

    Partly Sunny

    • 67
    • 83

    Mostly Sunny

    • 70
    • 89

    Mostly Sunny

Today 23 Sep Orange County Inland

Mostly sunny. Highs around 89.

Tonight 23 Sep Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 63 to 68. Areas of Winds south to 10 Mph this evening becoming light.

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Convention Center Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    77.9 °F

  • Highest 9 September, 2026

    108.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.2 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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