Tustin Weather Forecast

    • 73
    • 100

    Hot

    • 71
    • 98

    Mostly Sunny

    • 69
    • 95

    Mostly Sunny

    • 68
    • 91

    Mostly Sunny

    • 66
    • 83

    Partly Sunny

    • 62
    • 78

    Chance Rain Showers

    • 58
    • 75

    Slight Chance Rain Showers

Today 6 Oct Orange County Inland

Partly cloudy with a slight chance of Showers in the Morning, then mostly sunny in the afternoon. Highs around 76.

Tonight 6 Oct Orange County Inland

Clear. Lows 69 to 72. Areas of Winds south to 10 Mph this evening becoming light.

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Tustin Temperature Statistics

October Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 1 October, 2026

    67.6 °F

  • Average October

    83.3 °F

  • Highest 3 October, 2026

    100.9 °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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