Syphon Reservoir Weather Forecast

    • 63
    • 77

    Gradual Clearing

    • 61
    • 77

    Decreasing Clouds

    • 61
    • 79

    Partly Sunny

    • 60
    • 81

    Partly Sunny

    • 60
    • 79

    Mostly Cloudy

    • 60
    • 78

    Partly Sunny

    • 62
    • 80

    Partly Sunny

Today 21 Jul Orange County Inland

Cloudy this morning. Becoming mostly sunny. Patchy fog this morning. Highs 74 to 78. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 21 Jul Orange County Inland

Mostly cloudy with patchy fog and drizzle overnight. Lows 57 to 65. Areas of Winds southwest 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Syphon Reservoir Temperature Statistics

July Temperature

John Wayne-Orange County Airport (8.1 miles)

  • Lowest 2 July, 2025

    61.6 °F

  • Average July

    70.9 °F

  • Highest 8 July, 2025

    80.7 °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

    73.6 °F
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