Lake Hennessey Weather Forecast

    • 52
    • 90

    Increasing Clouds

    • 51
    • 84

    Mostly Sunny

    • 53
    • 86

    Partly Sunny

    • 54
    • 85

    Mostly Cloudy

    • 54
    • 82

    Mostly Cloudy

    • 54
    • 85

    Partly Sunny

Today 16 Jul North Bay Interior Valleys

Sunny. Highs in the mid 70s to lower 90s. West Winds 10 to 20 Mph.

Tonight 16 Jul North Bay Interior Valleys

Mostly clear. Lows in the upper 40s to mid 50s. West Winds 10 to 20 Mph. Becoming southwest 5 to 10 Mph after midnight.

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Lake Hennessey Temperature Statistics

July Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 11 July, 2026

    48.7 °F

  • Average July

    65.4 °F

  • Highest 13 July, 2026

    88 °F

Climate (2021–2026)

Napa, Napa County Airport (19.9 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    70.2 °F
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