Mare Island Shoreline Heritage Preserve Weather Forecast

    • 46
    • 56

    Increasing Clouds

    • 47
    • 58

    Partly Sunny

    • 48
    • 58

    Partly Sunny

    • 49
    • 59

    Partly Sunny

    • 49
    • 61

    Partly Sunny

    • 48
    • 61

    Partly Sunny

Today 6 Dec Carquinez Strait and Delta

Mostly cloudy in the morning then becoming partly cloudy. Widespread fog in the Morning, then patchy fog in the afternoon. Highs around 57. Light Winds.

Tonight 6 Dec Carquinez Strait and Delta

Mostly clear. Lows around 42. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mare Island Shoreline Heritage Preserve Temperature Statistics

December Temperature

Napa, Napa County Airport (8.7 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    47.9 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (8.7 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.2 °F
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