Napa River - North Slough Entrance Weather Forecast

    • 39
    • 51

    Becoming Sunny

    • 39
    • 50

    Mostly Sunny

    • 40
    • 50

    Partly Sunny

    • 44
    • 50

    Chance Rain

    • 47
    • 50

    Rain Likely

    • 46
    • 50

    Chance Rain

Today 28 Dec North Bay Interior Valleys

Sunny. Highs in the 40s to upper 50s. Northeast Winds 5 to 10 Mph.

Tonight 28 Dec North Bay Interior Valleys

Mostly clear. Areas of frost after midnight. Lows in the mid 30s to lower 40s. Northeast Winds 5 to 10 Mph.

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Napa River - North Slough Entrance Temperature Statistics

December Temperature

Napa, Napa County Airport (2.5 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    48.8 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (2.5 miles)

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  • Average Low 2020–2025

    47.1 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.1 °F
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