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

    • 48
    • 65

    Rain Likely

    • 47
    • 74

    Areas Fog

    • 47
    • 77

    Areas Fog

    • 49
    • 76

    Mostly Sunny

    • 54
    • 84

    Mostly Sunny

    • 53
    • 84

    Partly Sunny

    • 55
    • 84

    Partly Sunny

Today 3 Sep North Bay Interior Valleys

Mostly cloudy. A chance of rain. Highs in the lower 60s to mid 70s. Southwest Winds 10 to 20 Mph.

Tonight 3 Sep North Bay Interior Valleys

Partly cloudy. Patchy fog. Lows in the 40s to mid 50s. West Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

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

September Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 1 September, 2026

    59 °F

  • Average September

    63.9 °F

  • Highest 1 September, 2026

    72 °F

Climate (2021–2026)

Napa, Napa County Airport (19.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
Get WillyWeather+ to remove ads