Fullerton Weather Forecast

    • 59
    • 85

    Increasing Clouds

    • 58
    • 72

    Increasing Clouds

    • 57
    • 73

    Mostly Cloudy

    • 57
    • 76

    Partly Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 78

    Mostly Sunny

    • 58
    • 79

    Mostly Sunny

Today 11 May Orange County Inland

Partly cloudy this morning. Becoming sunny. Highs 73 to 76 towards the coast to 79 to 83 farther inland. Areas of Winds west to 10 Mph.

Tonight 11 May Orange County Inland

Partly cloudy. Patchy fog overnight. Lows 55 to 59. Areas of Winds southwest to 10 Mph this evening becoming light.

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Fullerton Temperature Statistics

May Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 6 May, 2026

    55.7 °F

  • Average May

    66.1 °F

  • Highest 7 May, 2026

    76.6 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.4 °F

  • Average High 2021–2026

    76.8 °F
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