Carquinez Strait - Mare Island Weather Forecast

    • 56
    • 69

    Mostly Sunny

    • 59
    • 75

    Mostly Sunny

    • 65
    • 78

    Partly Sunny

    • 69
    • 83

    Partly Sunny

    • 64
    • 81

    Mostly Sunny

    • 61
    • 73

    Partly Sunny

Today 6 Sep Southwestern Solano County Including Vallejo

Sunny. Highs 72 to 80. Southwest Winds 10 to 15 Mph with Gusts to around 25 Mph.

Tonight 6 Sep Southwestern Solano County Including Vallejo

Clear. Lows around 56. Southwest Winds up to 15 Mph.

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Carquinez Strait - Mare Island Temperature Statistics

September Temperature

Napa, Napa County Airport (9.3 miles)

  • Lowest 2 September, 2026

    54.6 °F

  • Average September

    63.9 °F

  • Highest 2 September, 2026

    74.6 °F

Climate (2021–2026)

Napa, Napa County Airport (9.3 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
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