Mare Island Strait - Vallejo Weather Forecast

    • 57
    • 67

    Increasing Clouds

    • 58
    • 64

    Partly Sunny

    • 58
    • 67

    Partly Sunny

    • 57
    • 74

    Mostly Sunny

    • 57
    • 73

    Partly Sunny

    • 57
    • 71

    Partly Sunny

Today 15 Sep Southwestern Solano County Including Vallejo

Sunny. Highs 74 to 84. Southwest Winds 10 to 15 Mph.

Tonight 15 Sep Southwestern Solano County Including Vallejo

Mostly clear. Lows around 57. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph.

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Mare Island Strait - Vallejo Temperature Statistics

September Temperature

Napa, Napa County Airport (6.8 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    67.2 °F

  • Highest 9 September, 2026

    99.6 °F

Climate (2021–2026)

Napa, Napa County Airport (6.8 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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