Lake Hennessey Weather Forecast

    • 50
    • 72

    Chance Rain

    • 50
    • 72

    Partly Sunny

    • 52
    • 79

    Mostly Sunny

    • 55
    • 86

    Sunny

    • 54
    • 86

    Mostly Sunny

    • 54
    • 86

    Partly Sunny

Today 28 May North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Highs in the 60s to mid 70s. Southeast Winds 5 to 15 Mph.

Tonight 28 May North Bay Interior Valleys

Cloudy. Patchy fog. A chance of rain. Lows in the upper 40s to mid 50s. Southeast Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Hennessey Temperature Statistics

May Temperature

Napa, Napa County Airport (19.9 miles)

  • Lowest 19 May, 2026

    44.7 °F

  • Average May

    62 °F

  • Highest 19 May, 2026

    89.7 °F

Climate (2021–Present)

Napa, Napa County Airport (19.9 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    70.2 °F
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