Third Napa Slough Weather Forecast

    • 56
    • 89

    Sunny

    • 55
    • 87

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

    • 55
    • 84

    Mostly Sunny

    • 56
    • 86

    Mostly Sunny

    • 58
    • 88

    Mostly Sunny

    • 55
    • 82

    Mostly Sunny

Today 3 Aug North Bay Interior Valleys

Sunny. Highs in the 80s to 90s. Southwest Winds 5 to 10 Mph.

Tonight 3 Aug North Bay Interior Valleys

Mostly clear. Lows in the lower 50s to mid 60s. Southwest Winds 5 to 10 Mph.

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Third Napa Slough Temperature Statistics

August Temperature

Napa, Napa County Airport (6.2 miles)

  • Lowest 1 August, 2026

    57.9 °F

  • Average August

    67.8 °F

  • Highest 1 August, 2026

    81 °F

Climate (2021–2026)

Napa, Napa County Airport (6.2 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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