Second Napa Slough Weather Forecast

    • 50
    • 65

    Chance Rain

    • 42
    • 62

    Rain

    • 44
    • 65

    Sunny

    • 46
    • 75

    Mostly Sunny

    • 49
    • 80

    Mostly Sunny

    • 49
    • 79

    Partly Sunny

    • 48
    • 73

    Partly Sunny

Today 31 Mar North Bay Interior Valleys

Mostly cloudy. A chance of rain. Highs in the 60s. South Winds 5 to 15 Mph.

Tonight 31 Mar North Bay Interior Valleys

Mostly cloudy. A slight chance of rain in the evening. A chance of rain after midnight. Patchy fog after midnight. Lows in the 40s to mid 50s. Southwest Winds 5 to 15 Mph.

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Second Napa Slough Temperature Statistics

March Temperature

Napa, Napa County Airport (6.8 miles)

  • Lowest 5 March, 2026

    37.7 °F

  • Average March

    60.5 °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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