Napa River - Fagan Slough Entrance Weather Forecast

    • 58
    • 82

    Becoming Sunny

    • 57
    • 86

    Mostly Sunny

    • 56
    • 78

    Partly Sunny

    • 56
    • 77

    Partly Sunny

    • 57
    • 75

    Partly Sunny

    • 57
    • 73

    Partly Sunny

    • 57
    • 74

    Partly Sunny

Today 8 Aug North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 70s to mid 90s. Southwest Winds 10 to 20 Mph.

Tonight 8 Aug North Bay Interior Valleys

Mostly clear. Lows in the 50s to 60s. Southwest Winds 10 to 20 Mph.

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Napa River - Fagan Slough Entrance Temperature Statistics

August Temperature

Napa, Napa County Airport (1.2 miles)

  • Lowest 6 August, 2026

    52 °F

  • Average August

    68.5 °F

  • Highest 2 August, 2026

    86.6 °F

Climate (2021–2026)

Napa, Napa County Airport (1.2 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
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