Napa River - Steamboat Slough Entrance Weather Forecast

    • 44
    • 62

    Fog

    • 41
    • 57

    Fog

    • 39
    • 60

    Mostly Sunny

    • 39
    • 56

    Mostly Cloudy

    • 39
    • 57

    Areas Fog

    • 44
    • 56

    Mostly Cloudy

Today 22 Jan North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs in the upper 50s to mid 60s. Southwest Winds 5 to 10 Mph.

Tonight 22 Jan North Bay Interior Valleys

Mostly cloudy. Areas of fog. Lows in the 40s to lower 50s. Northwest Winds up to 5 Mph.

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Napa River - Steamboat Slough Entrance Temperature Statistics

January Temperature

Napa, Napa County Airport (1.9 miles)

  • Lowest 9 January, 2026

    32 °F

  • Average January

    49 °F

  • Highest 15 January, 2026

    62.1 °F

Climate (2021–Present)

Napa, Napa County Airport (1.9 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    70 °F
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