Carquinez Strait - Mare Island Weather Forecast

    • 61
    • 77

    Becoming Sunny

    • 60
    • 73

    Mostly Sunny

    • 58
    • 72

    Mostly Sunny

    • 57
    • 74

    Mostly Sunny

    • 57
    • 75

    Mostly Sunny

    • 58
    • 77

    Mostly Sunny

Today 21 Jul Southwestern Solano County Including Vallejo

Mostly sunny. Warmer. Highs 84 to 94. West Winds 10 to 15 Mph.

Tonight 21 Jul Southwestern Solano County Including Vallejo

Clear. Lows 61 to 67. Southwest Winds 10 to 15 Mph with Gusts to around 25 Mph.

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Carquinez Strait - Mare Island Temperature Statistics

July Temperature

Napa, Napa County Airport (9.3 miles)

  • Lowest 11 July, 2026

    48.7 °F

  • Average July

    66 °F

  • Highest 13 July, 2026

    89.7 °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

    58.4 °F

  • Average High 2021–2026

    70.2 °F
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