Cornerstone Weather Forecast

    • 54
    • 87

    Increasing Clouds

    • 54
    • 85

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

    • 53
    • 78

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

Today 10 May Carquinez Strait and Delta

Sunny. Highs 85 to 91. Northwest Winds up to 10 Mph.

Tonight 10 May Carquinez Strait and Delta

Clear. Lows around 56. West Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cornerstone Temperature Statistics

May Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 5 May, 2024

    38.6 °F

  • Average May

    57.8 °F

  • Highest 8 May, 2024

    80.1 °F

Climate (2019–Present)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2019–2024

    47 °F

  • Average 2019–2024

    57.7 °F

  • Average High 2019–2024

    70.4 °F
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