Tustin Weather Forecast

    • 49
    • 63

    Rain Showers Likely

    • 46
    • 62

    Mostly Sunny

    • 48
    • 65

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 51
    • 71

    Partly Sunny

    • 53
    • 68

    Chance Rain Showers

    • 54
    • 66

    Chance Rain Showers

Today 26 Dec Orange County Inland

Showers and a slight chance of Thunderstorms. Locally heavy rainfall possible. Highs around 64 towards the coast to 60 to 63 farther inland. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph. Becoming 25 Mph this afternoon.

Tonight 26 Dec Orange County Inland

Cloudy with a chance of Showers and a slight chance of Thunderstorms this Evening, then partly cloudy overnight. Colder. Lows 44 to 49. Areas of Winds west 10 Mph this evening becoming light. Chance of measurable precipitation 50 percent.

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Tustin Temperature Statistics

December Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 6 December, 2025

    48 °F

  • Average December

    59.8 °F

  • Highest 9 December, 2025

    82 °F

Climate (2020–Present)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.6 °F

  • Average High 2020–2025

    73.3 °F
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