Ralph B Clark Regional Park Weather Forecast

    • 68
    • 89

    Mostly Sunny

    • 69
    • 90

    Partly Sunny

    • 67
    • 86

    Partly Sunny

    • 66
    • 82

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 69
    • 91

    Mostly Sunny

Today 25 Sep Orange County Inland

Partly cloudy with patchy fog in the morning. Becoming sunny. Highs around 85 towards the coast to 90 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 25 Sep Orange County Inland

Partly cloudy. Patchy fog overnight. Lows 63 to 68. Areas of Winds west to 10 Mph in the evening becoming light.

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Ralph B Clark Regional Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (1.2 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    77.7 °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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