Syphon Reservoir Weather Forecast

    • 53
    • 75

    Increasing Clouds

    • 56
    • 74

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 54
    • 77

    Patchy Fog

    • 54
    • 73

    Patchy Fog

    • 54
    • 72

    Patchy Fog

Today 16 Dec Orange County Inland

Partly cloudy this morning. Becoming mostly sunny. Areas of fog this morning. Local visibility one quarter mile or less at Times this morning. Warmer. Highs 73 to 77. Light Winds.

Tonight 16 Dec Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Local visibility one quarter mile or less at Times overnight. Lows 50 to 53. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Syphon Reservoir Temperature Statistics

December Temperature

John Wayne-Orange County Airport (8.1 miles)

  • Lowest 6 December, 2025

    48 °F

  • Average December

    60.2 °F

  • Highest 9 December, 2025

    82 °F

Climate (2020–Present)

John Wayne-Orange County Airport (8.1 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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