Los Nietos Park Weather Forecast

    • 67
    • 84

    Decreasing Clouds

    • 66
    • 81

    Partly Sunny

    • 67
    • 85

    Mostly Sunny

    • 68
    • 87

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 69
    • 88

    Partly Sunny

Today 20 Sep Los Angeles County San Gabriel Valley

Low Clouds and fog mostly clearing in the afternoon. Highs in the upper 70s to mid 80s.

Tonight 20 Sep Los Angeles County San Gabriel Valley

Partly cloudy in the evening then low Clouds and fog. Lows in the lower to mid 60s.

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Los Nietos Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (7.5 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    78.6 °F

  • Highest 9 September, 2026

    108.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (7.5 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    76.9 °F
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