San Joaquin Reservoir Weather Forecast

    • 52
    • 70

    Mostly Sunny

    • 52
    • 69

    Partly Sunny

    • 53
    • 66

    Mostly Cloudy

    • 51
    • 64

    Patchy Fog

    • 52
    • 63

    Partly Sunny

    • 52
    • 66

    Mostly Sunny

Today 19 Jan Orange County Coastal

Partly cloudy this morning. Becoming mostly sunny. Highs around 70 at the Beaches to 71 to 74 farther inland and near higher coastal Terrain. Light Winds.

Tonight 19 Jan Orange County Coastal

Mostly clear in the evening. Becoming partly cloudy. Lows around 51. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Joaquin Reservoir Temperature Statistics

January Temperature

John Wayne-Orange County Airport (4.3 miles)

  • Lowest 8 January, 2026

    48 °F

  • Average January

    61.1 °F

  • Highest 14 January, 2026

    82 °F

Climate (2021–Present)

John Wayne-Orange County Airport (4.3 miles)

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  • Average Low 2021–2026

    58.8 °F

  • Average 2021–2026

    65.7 °F

  • Average High 2021–2026

    73.3 °F
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