Fullerton Weather Forecast

    • 44
    • 65

    Sunny

    • 48
    • 69

    Sunny

    • 50
    • 73

    Mostly Sunny

    • 51
    • 74

    Mostly Sunny

    • 53
    • 76

    Sunny

    • 54
    • 79

    Sunny

    • 53
    • 78

    Mostly Sunny

Today 9 Jan Orange County Inland

Sunny. Areas of blowing dust. Highs 62 to 65. Areas of Winds northeast 30 to 40 Mph with Gusts to 65 Mph. Becoming 20 to 30 Mph with Gusts to 45 Mph this afternoon.

Tonight 9 Jan Orange County Inland

Clear. Areas of blowing dust. Lows 43 to 46. Areas of Winds northeast 25 to 35 Mph with Gusts to 60 Mph.

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Fullerton Temperature Statistics

January Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 7 January, 2026

    50 °F

  • Average January

    58.7 °F

  • Highest 7 January, 2026

    68 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    76.4 °F
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