Fullerton Weather Forecast

    • 60
    • 85

    Increasing Clouds

    • 59
    • 84

    Partly Sunny

    • 60
    • 83

    Partly Sunny

    • 62
    • 91

    Patchy Fog

    • 64
    • 94

    Mostly Sunny

    • 64
    • 92

    Patchy Fog

    • 63
    • 91

    Mostly Sunny

Today 5 Jul Los Angeles County San Gabriel Valley

Low Clouds and fog in the morning then sunny. Highs in the mid 80s to around 90.

Tonight 5 Jul Los Angeles County San Gabriel Valley

Clear except for patchy low Clouds and fog after midnight. Lows around 60.

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Fullerton Temperature Statistics

July Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 1 July, 2025

    61 °F

  • Average July

    68.3 °F

  • Highest 1 July, 2025

    79 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.8 °F
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