South Slough Weather Forecast

    • 57
    • 87

    Increasing Clouds

    • 50
    • 81

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 52
    • 79

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

Today 20 Mar Carquinez Strait and Delta

Widespread fog. Locally dense in the morning. Sunny. Highs 86 to 92. Light Winds.

Tonight 20 Mar Carquinez Strait and Delta

Mostly clear. Lows around 57. West Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Slough Temperature Statistics

March Temperature

Napa, Napa County Airport (5 miles)

  • Lowest 5 March, 2026

    37.7 °F

  • Average March

    57.8 °F

  • Highest 16 March, 2026

    81 °F

Climate (2021–Present)

Napa, Napa County Airport (5 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    70.2 °F
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