Lake Hennessey Weather Forecast

    • 62
    • 92

    Sunny

    • 59
    • 95

    Mostly Sunny

    • 56
    • 85

    Mostly Cloudy

    • 54
    • 79

    Partly Sunny

    • 56
    • 84

    Mostly Sunny

    • 59
    • 89

    Mostly Sunny

Today 16 Sep North Bay Interior Valleys

Sunny. Highs in the lower 80s to mid 90s. South Winds 5 to 10 Mph.

Tonight 16 Sep North Bay Interior Valleys

Mostly clear. Lows in the lower 50s to mid 60s. West Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Hennessey Temperature Statistics

September Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    65.7 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

Napa, Napa County Airport (19.9 miles)

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

  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
Get WillyWeather+ to remove ads