Napa River - Steamboat Slough Entrance Weather Forecast

    • 57
    • 88

    Sunny

    • 57
    • 90

    Sunny

    • 59
    • 90

    Mostly Sunny

    • 58
    • 90

    Mostly Sunny

    • 54
    • 83

    Partly Sunny

    • 50
    • 78

    Partly Sunny

Today 17 Mar North Bay Interior Valleys

Sunny. Highs in the upper 70s to mid 90s. Northeast Winds up to 5 Mph. Becoming southwest in the afternoon.

Tonight 17 Mar North Bay Interior Valleys

Clear. Lows in the lower 50s to mid 60s. North Winds up to 5 Mph.

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Napa River - Steamboat Slough Entrance Temperature Statistics

March Temperature

Napa, Napa County Airport (1.9 miles)

  • Lowest 5 March, 2026

    37.7 °F

  • Average March

    57.3 °F

  • Highest 7 March, 2026

    77 °F

Climate (2021–Present)

Napa, Napa County Airport (1.9 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    70.1 °F
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