Tustin Weather Forecast

    • 66
    • 87

    Mostly Sunny

    • 67
    • 85

    Partly Sunny

    • 68
    • 90

    Mostly Sunny

    • 74
    • 93

    Mostly Sunny

    • 76
    • 97

    Hot

    • 76
    • 98

    Hot

    • 75
    • 96

    Hot

Today 29 Sep Orange County Inland

Mostly sunny. Highs around 93 towards the coast to 95 to 98 farther inland.

Tonight 29 Sep Orange County Inland

Clear this evening. Becoming partly cloudy. Lows 59 to 66. Areas of Winds south 10 Mph.

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Tustin Temperature Statistics

September Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    76.4 °F

  • Highest 9 September, 2026

    102.7 °F

Climate (2021–2026)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2021–2026

    59.1 °F

  • Average 2021–2026

    66.2 °F

  • Average High 2021–2026

    73.8 °F
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