Second Napa Slough Weather Forecast

    • 54
    • 78

    Increasing Clouds

    • 54
    • 75

    Mostly Cloudy

    • 55
    • 77

    Partly Sunny

    • 55
    • 78

    Partly Sunny

    • 55
    • 77

    Partly Sunny

    • 54
    • 77

    Partly Sunny

Today 16 Aug North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 70s to 80s. Southwest Winds 5 to 15 Mph.

Tonight 16 Aug North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the 50s. Southwest Winds 5 to 15 Mph.

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Second Napa Slough Temperature Statistics

August Temperature

Napa, Napa County Airport (6.8 miles)

  • Lowest 6 August, 2026

    51.7 °F

  • Average August

    66.3 °F

  • Highest 2 August, 2026

    86.6 °F

Climate (2021–2026)

Napa, Napa County Airport (6.8 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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