Carquinez Strait - Mare Island Weather Forecast

    • 56
    • 65

    Becoming Sunny

    • 56
    • 69

    Mostly Sunny

    • 56
    • 69

    Mostly Sunny

    • 58
    • 75

    Mostly Sunny

    • 58
    • 78

    Mostly Sunny

    • 57
    • 75

    Mostly Sunny

Today 17 Aug Carquinez Strait and Delta

Mostly sunny. Near the Bay, mostly cloudy in the morning then clearing. Highs 75 to 81. Southwest Winds 10 to 20 Mph with Gusts to around 30 Mph.

Tonight 17 Aug Carquinez Strait and Delta

Clear. Lows around 56. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph.

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Carquinez Strait - Mare Island Temperature Statistics

August Temperature

Napa, Napa County Airport (9.3 miles)

  • Lowest 3 August, 2025

    50.6 °F

  • Average August

    66.6 °F

  • Highest 6 August, 2025

    88.6 °F

Climate (2020–Present)

Napa, Napa County Airport (9.3 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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