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

    • 44
    • 51

    Rain Showers

    • 40
    • 51

    Rain

    • 37
    • 51

    Mostly Sunny

    • 36
    • 53

    Mostly Sunny

    • 36
    • 55

    Mostly Sunny

    • 38
    • 57

    Mostly Sunny

Today 25 Dec North Bay Interior Valleys

Breezy. Patchy dense fog in the morning. Showers and a slight chance of Thunderstorms. Some Thunderstorms may be severe with heavy rainfall. Highs in the 40s to upper 50s. South Winds 20 to 30 Mph. Gusts up to 50 Mph in the morning.

Tonight 25 Dec North Bay Interior Valleys

Breezy. Showers and a slight chance of Thunderstorms. Some Thunderstorms may produce damaging Winds and heavy rainfall. Lows in the 40s to mid 50s. South Winds 20 to 30 Mph with Gusts to around 50 Mph.

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

December Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    48.2 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (19.9 miles)

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  • Average Low 2020–2025

    47.1 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.1 °F
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