Steamboat Slough Weather Forecast

    • 50
    • 76

    Increasing Clouds

    • 50
    • 77

    Becoming Sunny

    • 52
    • 75

    Partly Sunny

    • 52
    • 75

    Partly Sunny

    • 54
    • 81

    Mostly Sunny

    • 55
    • 89

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

Today 5 Jul North Bay Interior Valleys

Sunny. Highs in the upper 60s to lower 80s. Southwest Winds 5 to 15 Mph.

Tonight 5 Jul North Bay Interior Valleys

Mostly clear. Lows in the upper 40s to mid 50s. West Winds 10 to 20 Mph. Becoming southwest 5 to 10 Mph after midnight.

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Steamboat Slough Temperature Statistics

July Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 3 July, 2025

    51.1 °F

  • Average July

    61.1 °F

  • Highest 1 July, 2025

    72 °F

Climate (2020–Present)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.6 °F
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