Mare Island Shoreline Heritage Preserve Weather Forecast

    • 55
    • 65

    Gradual Clearing

    • 57
    • 71

    Mostly Sunny

    • 59
    • 77

    Mostly Sunny

    • 59
    • 80

    Mostly Sunny

    • 58
    • 75

    Mostly Sunny

    • 58
    • 77

    Mostly Sunny

Today 27 Sep Southwestern Solano County Including Vallejo

Mostly cloudy in the morning then clearing. Highs 66 to 74. Southwest Winds 10 to 15 Mph.

Tonight 27 Sep Southwestern Solano County Including Vallejo

Mostly clear. Lows around 53. Southwest Winds 10 to 15 Mph.

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Mare Island Shoreline Heritage Preserve Temperature Statistics

September Temperature

Napa, Napa County Airport (8.7 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    66 °F

  • Highest 9 September, 2026

    99.6 °F

Climate (2021–2026)

Napa, Napa County Airport (8.7 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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