Napa River - Fagan Slough Entrance Weather Forecast

    • 46
    • 61

    Increasing Clouds

    • 51
    • 58

    Chance Rain

    • 53
    • 56

    Rain

    • 53
    • 56

    Rain

    • 52
    • 57

    Rain

    • 49
    • 54

    Rain Likely

Today 17 Dec North Bay Interior Valleys

Becoming partly cloudy in the afternoon. Rain in the morning. A slight chance of rain in the afternoon. Highs in the 50s to mid 60s. West Winds 5 to 15 Mph.

Tonight 17 Dec North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the Evening, then Areas of fog after midnight. Lows in the 40s. Northwest Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Napa River - Fagan Slough Entrance Temperature Statistics

December Temperature

Napa, Napa County Airport (1.2 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    44.4 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (1.2 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    70.1 °F
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