Napa River - Fagan Slough Entrance Weather Forecast

    • 49
    • 80

    Increasing Clouds

    • 50
    • 79

    Partly Sunny

    • 52
    • 85

    Partly Sunny

    • 51
    • 80

    Partly Sunny

    • 50
    • 72

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

Today 9 May North Bay Interior Valleys

Sunny. Highs in the 70s to 80s. Southwest Winds 5 to 15 Mph.

Tonight 9 May North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s to lower 60s. West Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Napa River - Fagan Slough Entrance Temperature Statistics

May Temperature

Napa, Napa County Airport (1.2 miles)

  • Lowest 4 May, 2026

    46.7 °F

  • Average May

    59.1 °F

  • Highest 6 May, 2026

    74.6 °F

Climate (2021–Present)

Napa, Napa County Airport (1.2 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.3 °F

  • Average High 2021–2026

    70.2 °F
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