Lake Hennessey Weather Forecast

    • 48
    • 65

    Rain Likely

    • 47
    • 73

    Mostly Sunny

    • 48
    • 76

    Areas Fog

    • 50
    • 76

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 54
    • 84

    Partly Sunny

    • 56
    • 84

    Partly Sunny

Today 3 Sep North Bay Interior Valleys

Rain likely late in the Morning, then a chance of rain in the afternoon. 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 after midnight. Lows in the 40s to mid 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Hennessey 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)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
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