Fullerton Weather Forecast

    • 67
    • 98

    Hot

    • 65
    • 94

    Mostly Sunny

    • 64
    • 83

    Partly Sunny

    • 64
    • 84

    Partly Sunny

    • 64
    • 85

    Partly Sunny

    • 64
    • 85

    Partly Sunny

Today 15 Jul Los Angeles County San Gabriel Valley

Sunny. Highs 96 to 103.

Tonight 15 Jul Los Angeles County San Gabriel Valley

Mostly clear. Lows in the mid 60s to around 70.

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Fullerton Temperature Statistics

July Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 3 July, 2026

    61.6 °F

  • Average July

    73.9 °F

  • Highest 6 July, 2026

    87.7 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.5 °F

  • Average High 2021–2026

    76.8 °F
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