Napa County Regional Park District - Lake Hennessey City Recreation Area Weather Forecast

    • 52
    • 86

    Increasing Clouds

    • 50
    • 84

    Becoming Sunny

    • 51
    • 88

    Mostly Sunny

    • 54
    • 90

    Mostly Sunny

    • 55
    • 93

    Mostly Sunny

    • 54
    • 93

    Mostly Sunny

    • 53
    • 90

    Mostly Sunny

Today 26 Aug North Bay Interior Valleys

Sunny. A slight chance of Thunderstorms. Highs in the upper 60s to mid 80s. Southwest Winds 10 to 15 Mph.

Tonight 26 Aug North Bay Interior Valleys

Mostly clear 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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Napa County Regional Park District - Lake Hennessey City Recreation Area Temperature Statistics

August Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 19 August, 2025

    48.7 °F

  • Average August

    67 °F

  • Highest 21 August, 2025

    91.7 °F

Climate (2020–Present)

Napa, Napa County Airport (19.9 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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