Pioneer Park Weather Forecast

    • 76
    • 96

    Hot

    • 75
    • 99

    Hot

    • 71
    • 93

    Mostly Sunny

    • 67
    • 88

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

Today 8 Sep Orange County Inland

Partly cloudy this morning. Becoming mostly sunny. Highs 94 to 98. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 8 Sep Orange County Inland

Mostly clear in the evening. Becoming partly cloudy. Lows 72 to 76. Areas of Winds west to 10 Mph in the evening becoming light.

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Pioneer Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    74.8 °F

  • Highest 5 September, 2026

    91.7 °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

    66.6 °F

  • Average High 2021–2026

    76.9 °F
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