Dutchman Slough - Knight Island Weather Forecast

    • 68
    • 90

    Increasing Clouds

    • 61
    • 80

    Partly Sunny

    • 59
    • 73

    Mostly Sunny

    • 57
    • 70

    Breezy

    • 57
    • 74

    Mostly Sunny

    • 57
    • 74

    Mostly Sunny

Today 9 Sep Southwestern Solano County Including Vallejo

Mostly sunny. Warmer. Highs 92 to 102. West Winds up to 10 Mph.

Tonight 9 Sep Southwestern Solano County Including Vallejo

Mostly clear. Lows 67 to 73. West Winds up to 10 Mph.

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Dutchman Slough - Knight Island Temperature Statistics

September Temperature

Napa, Napa County Airport (5.6 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    64.3 °F

  • Highest 7 September, 2026

    87.1 °F

Climate (2021–2026)

Napa, Napa County Airport (5.6 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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