Fullerton Weather Forecast

    • 56
    • 84

    Sunny

    • 56
    • 86

    Mostly Sunny

    • 53
    • 79

    Partly Sunny

    • 53
    • 75

    Partly Sunny

    • 55
    • 80

    Sunny

    • 58
    • 85

    Mostly Sunny

    • 56
    • 83

    Partly Sunny

Today 30 Jan Orange County Inland

Sunny. Highs 81 to 84. Areas of Winds northeast 10 to 20 Mph with Gusts to 30 Mph.

Tonight 30 Jan Orange County Inland

Clear. Lows 54 to 58. Areas of Winds east 10 to 15 Mph. Gusts to 30 Mph. Becoming 25 Mph overnight.

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Fullerton Temperature Statistics

January Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 10 January, 2026

    39.7 °F

  • Average January

    60.8 °F

  • Highest 14 January, 2026

    85.6 °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

    76.5 °F
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