Downtown Fullerton Weather Forecast

    • 63
    • 80

    Becoming Sunny

    • 65
    • 85

    Mostly Sunny

    • 64
    • 85

    Partly Sunny

    • 66
    • 84

    Mostly Sunny

    • 66
    • 84

    Mostly Sunny

    • 65
    • 82

    Mostly Sunny

Today 9 Jun Orange County Inland

Partly cloudy this morning. Becoming mostly sunny. Highs around 77 towards the coast to 80 farther inland. Areas of Winds southwest to 10 Mph.

Tonight 9 Jun Orange County Inland

Mostly clear this evening. Becoming partly cloudy. Lows 58 to 63. Areas of Winds south to 10 Mph this evening becoming light.

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Downtown Fullerton Temperature Statistics

June Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 1 June, 2026

    62.7 °F

  • Average June

    70.1 °F

  • Highest 3 June, 2026

    79.6 °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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