Cornerstone Weather Forecast

    • 39
    • 54

    Increasing Clouds

    • 43
    • 54

    Mostly Cloudy

    • 50
    • 54

    Rain Showers

    • 52
    • 59

    Rain Showers

    • 50
    • 60

    Chance Rain Showers

    • 46
    • 58

    Rain Showers Likely

Today 29 Jan Carquinez Strait and Delta

Mostly cloudy in the morning then clearing. Near the Bay, mostly cloudy. Areas of frost in the morning. Highs 53 to 59. Light Winds.

Tonight 29 Jan Carquinez Strait and Delta

Mostly clear. Lows 33 to 39. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cornerstone Temperature Statistics

January Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 22 January, 2025

    28.9 °F

  • Average January

    49.2 °F

  • Highest 7 January, 2025

    70.6 °F

Climate (2020–Present)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.7 °F
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