Fullerton Weather Forecast

    • 71
    • 92

    Partly Sunny

    • 69
    • 92

    Mostly Sunny

    • 68
    • 90

    Partly Sunny

    • 66
    • 87

    Partly Sunny

    • 65
    • 87

    Mostly Sunny

    • 66
    • 87

    Patchy Fog

Today 23 Aug Orange County Inland

Patchy fog this morning. Partly cloudy with a slight chance of Showers and Thunderstorms. Highs 86 to 89 towards the coast to 91 to 94 farther inland. Light Winds becoming southwest 10 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 23 Aug Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows around 70. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Fullerton Temperature Statistics

August Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 3 August, 2025

    63.6 °F

  • Average August

    75.5 °F

  • Highest 7 August, 2025

    95.6 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (3.1 miles)

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  • Average Low 2020–2025

    56.7 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.7 °F
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