Green Valley Weather Forecast

    • 56
    • 78

    Becoming Sunny

    • 55
    • 83

    Partly Sunny

    • 51
    • 75

    Mostly Cloudy

    • 50
    • 67

    Chance Rain

    • 48
    • 66

    Chance Rain

    • 46
    • 65

    Sunny

    • 50
    • 72

    Sunny

Today 28 Mar Carquinez Strait and Delta

Sunny. Highs 77 to 83. Light Winds.

Tonight 28 Mar Carquinez Strait and Delta

Mostly clear. Lows 50 to 56. West Winds up to 10 Mph.

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Green Valley Temperature Statistics

March Temperature

Napa, Napa County Airport (6.8 miles)

  • Lowest 5 March, 2026

    37.7 °F

  • Average March

    60.3 °F

  • Highest 20 March, 2026

    87.7 °F

Climate (2021–Present)

Napa, Napa County Airport (6.8 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    58.3 °F

  • Average High 2021–2026

    70.2 °F
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