Rancho Santa Margarita Weather Forecast

    • 54
    • 76

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 53
    • 78

    Partly Sunny

    • 54
    • 72

    Partly Sunny

    • 54
    • 72

    Patchy Fog

Today 16 Dec Orange County Inland

Partly cloudy with patchy fog in the morning. Becoming mostly sunny. Highs around 73 towards the coast to 75 to 78 farther inland. Light Winds.

Tonight 16 Dec Orange County Inland

Partly cloudy. Patchy fog overnight. Lows 51 to 54. Light Winds.

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  • Temperature Real-Time

Rancho Santa Margarita Temperature Statistics

December Temperature

John Wayne-Orange County Airport (14.9 miles)

  • Lowest 6 December, 2025

    48 °F

  • Average December

    60.4 °F

  • Highest 9 December, 2025

    82 °F

Climate (2020–Present)

John Wayne-Orange County Airport (14.9 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    65.6 °F

  • Average High 2020–2025

    73.4 °F
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