Napa River - Fagan Slough Entrance Weather Forecast

    • 57
    • 76

    Becoming Sunny

    • 57
    • 76

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 58
    • 75

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 56
    • 77

    Mostly Sunny

Today 5 Sep North Bay Interior Valleys

Sunny. Highs in the lower 70s to mid 80s. Southwest Winds 10 to 15 Mph.

Tonight 5 Sep North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the 50s. Southwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Napa River - Fagan Slough Entrance Temperature Statistics

September Temperature

Napa, Napa County Airport (1.2 miles)

  • Lowest 3 September, 2025

    52 °F

  • Average September

    67.8 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

Napa, Napa County Airport (1.2 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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