Fullerton Weather Forecast

    • 70
    • 97

    Hot

    • 71
    • 96

    Mostly Sunny

    • 73
    • 96

    Mostly Sunny

    • 74
    • 97

    Hot

    • 74
    • 100

    Hot

    • 75
    • 101

    Hot

Today 23 Aug Orange County Inland

Mostly sunny. Highs 87 to 92 towards the coast to 96 to 99 farther inland. Light Winds becoming west 10 Mph this afternoon.

Tonight 23 Aug Orange County Inland

Mostly clear. Lows 65 to 70. Light Winds.

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Fullerton Temperature Statistics

August Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 16 August, 2026

    66.7 °F

  • Average August

    79.8 °F

  • Highest 8 August, 2026

    97.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.6 °F

  • Average High 2021–2026

    76.8 °F
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