Pioneer Park Weather Forecast

    • 56
    • 73

    Decreasing Clouds

    • 61
    • 82

    Partly Sunny

    • 62
    • 88

    Mostly Sunny

    • 63
    • 91

    Mostly Sunny

    • 63
    • 89

    Partly Sunny

    • 60
    • 82

    Partly Sunny

    • 59
    • 79

    Mostly Sunny

Today 18 May Orange County Inland

Mostly cloudy this morning. Becoming partly cloudy. Warmer. Highs 70 to 74. Areas of Winds southeast 10 Mph becoming southwest this afternoon.

Tonight 18 May Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 51 to 56. Areas of Winds southwest 10 Mph this evening becoming light.

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Pioneer Park Temperature Statistics

May Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 8 May, 2025

    54.6 °F

  • Average May

    66.9 °F

  • Highest 10 May, 2025

    99.6 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.8 °F
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