Dutchman Slough - Knight Island Weather Forecast

    • 62
    • 69

    Slight Chance Rain Showers

    • 60
    • 70

    Slight Chance Rain Showers

    • 60
    • 73

    Mostly Sunny

    • 61
    • 76

    Mostly Sunny

    • 62
    • 81

    Mostly Sunny

    • 62
    • 70

    Chance Rain Showers

Today 18 Sep Carquinez Strait and Delta

Mostly cloudy. Highs 81 to 87. Except 75 to 81 near the bay. Southwest Winds 10 to 15 Mph.

Tonight 18 Sep Carquinez Strait and Delta

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of rain Showers and a slight chance of Thunderstorms after midnight. Lows 61 to 67. West Winds up to 15 Mph.

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Dutchman Slough - Knight Island Temperature Statistics

September Temperature

Napa, Napa County Airport (5.6 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    66.1 °F

  • Highest 15 September, 2025

    91 °F

Climate (2020–Present)

Napa, Napa County Airport (5.6 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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