Tustin Weather Forecast

    • 59
    • 79

    Increasing Clouds

    • 58
    • 72

    Mostly Cloudy

    • 59
    • 75

    Partly Sunny

    • 59
    • 79

    Partly Sunny

    • 59
    • 76

    Mostly Cloudy

    • 58
    • 74

    Partly Sunny

Today 21 Oct Orange County Inland

Partly cloudy with patchy fog in the morning. Becoming mostly sunny. Highs 75 to 78 towards the coast to 80 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 21 Oct Orange County Inland

Partly cloudy in the evening. Becoming mostly cloudy overnight with patchy fog. Lows 54 to 60. Light Winds.

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Tustin Temperature Statistics

October Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 16 October, 2025

    54 °F

  • Average October

    66.7 °F

  • Highest 18 October, 2025

    84 °F

Climate (2020–Present)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2020–2025

    58.6 °F

  • Average 2020–2025

    65.6 °F

  • Average High 2020–2025

    73.4 °F
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