Pioneer Park Weather Forecast

    • 73
    • 99

    Hot

    • 77
    • 101

    Hot

    • 77
    • 104

    Patchy Fog

    • 75
    • 104

    Hot

    • 71
    • 95

    Mostly Sunny

    • 68
    • 90

    Mostly Sunny

Today 25 Aug Orange County Inland

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 90 to 94 towards the coast to 100 farther inland. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 25 Aug Orange County Inland

Mostly clear. Lows 68 to 72. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Pioneer Park Temperature Statistics

August Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 16 August, 2026

    66.7 °F

  • Average August

    80.3 °F

  • Highest 23 August, 2026

    99 °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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