Tustin Weather Forecast

    • 53
    • 64

    Rain Showers

    • 52
    • 64

    Mostly Cloudy

    • 49
    • 65

    Partly Sunny

    • 49
    • 66

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

Today 4 Jan Orange County Inland

Mostly cloudy. A chance of Showers this Morning, then Showers likely and a slight chance of Thunderstorms this afternoon. Highs around 63. Areas of Winds south 10 Mph. Chance of measurable precipitation 70 percent.

Tonight 4 Jan Orange County Inland

Showers this Evening, then Showers likely and a slight chance of Thunderstorms overnight. Lows 49 to 53. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph becoming southwest overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tustin Temperature Statistics

January Temperature

John Wayne-Orange County Airport (5 miles)

  • Lowest 1 January, 2026

    57 °F

  • Average January

    62.3 °F

  • Highest 2 January, 2026

    68 °F

Climate (2021–Present)

John Wayne-Orange County Airport (5 miles)

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  • Average Low 2021–2026

    58.8 °F

  • Average 2021–2026

    65.6 °F

  • Average High 2021–2026

    73.3 °F
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