Fullerton Weather Forecast

    • 61
    • 84

    Decreasing Clouds

    • 60
    • 82

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 58
    • 76

    Mostly Sunny

    • 57
    • 76

    Mostly Sunny

    • 57
    • 75

    Mostly Sunny

Today 15 Jun Los Angeles County San Gabriel Valley

Partly cloudy in the morning then sunny. Patchy fog in the morning. Highs in the mid to upper 80s.

Tonight 15 Jun Los Angeles County San Gabriel Valley

Mostly clear in the evening then partly cloudy. Lows in the upper 50s to mid 60s.

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Fullerton Temperature Statistics

June Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 1 June, 2026

    62.7 °F

  • Average June

    71.5 °F

  • Highest 12 June, 2026

    91 °F

Climate (2021–Present)

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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