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

    • 45
    • 60

    Fog

    • 46
    • 68

    Areas Fog

    • 44
    • 68

    Mostly Sunny

    • 43
    • 67

    Mostly Sunny

    • 43
    • 64

    Areas Fog

    • 45
    • 61

    Areas Fog

Today 9 Dec North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the lower 50s to mid 60s. Northeast Winds up to 5 Mph. Becoming south in the afternoon.

Tonight 9 Dec North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Areas of fog. Lows in the 40s to lower 50s. North Winds up to 5 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

    45.9 °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 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.1 °F
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