Frontier Park Weather Forecast

    • 67
    • 77

    Mostly Cloudy

    • 68
    • 81

    Mostly Sunny

    • 69
    • 88

    Mostly Sunny

    • 70
    • 87

    Mostly Sunny

    • 70
    • 89

    Partly Sunny

    • 69
    • 89

    Partly Sunny

    • 67
    • 84

    Mostly Sunny

Today 21 Sep Los Angeles County Inland Coast including Downtown Los Angeles

Partly cloudy in the morning then sunny. Highs in the lower to mid 80s.

Tonight 21 Sep Los Angeles County Inland Coast including Downtown Los Angeles

Mostly clear in the evening then Areas of low Clouds and fog. Lows in the lower to mid 60s.

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  • Temperature Real-Time

Frontier Park Temperature Statistics

September Temperature

Fullerton, Fullerton Municipal Airport (3.7 miles)

  • Lowest 2 September, 2026

    63.6 °F

  • Average September

    78.1 °F

  • Highest 9 September, 2026

    108.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (3.7 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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