Cornerstone Weather Forecast

    • 50
    • 76

    Becoming Sunny

    • 50
    • 69

    Becoming Sunny

    • 52
    • 69

    Partly Sunny

    • 49
    • 65

    Partly Sunny

    • 51
    • 71

    Mostly Sunny

    • 51
    • 74

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

Today 30 Apr Carquinez Strait and Delta

Partly cloudy in the morning then clearing. Highs 78 to 84. West Winds up to 10 Mph.

Tonight 30 Apr Carquinez Strait and Delta

Clear. Lows around 52. West Winds 10 to 15 Mph.

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Cornerstone Temperature Statistics

April Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 2 April, 2025

    35.7 °F

  • Average April

    56.2 °F

  • Highest 9 April, 2025

    77.6 °F

Climate (2020–Present)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58.2 °F

  • Average High 2020–2025

    70.7 °F
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