Napa River - Mud Slough Entrance Weather Forecast

    • 56
    • 59

    Rain

    • 52
    • 57

    Rain

    • 49
    • 57

    Rain

    • 50
    • 53

    Rain

    • 47
    • 51

    Rain

    • 40
    • 50

    Rain

    • 38
    • 50

    Chance Rain

Today 21 Dec North Bay Interior Valleys

Rain. Highs in the mid 50s to lower 60s. South Winds 10 to 20 Mph with Gusts to around 40 Mph.

Tonight 21 Dec North Bay Interior Valleys

Breezy. Rain in the Evening, then rain likely after midnight. Patchy fog after midnight. Lows in the upper 40s to mid 50s. South Winds 20 to 30 Mph. Becoming southwest 10 to 20 Mph after midnight.

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Napa River - Mud Slough Entrance Temperature Statistics

December Temperature

Napa, Napa County Airport (1.9 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    46.1 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (1.9 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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