Steamboat Slough Weather Forecast

    • 53
    • 80

    Becoming Sunny

    • 55
    • 89

    Mostly Sunny

    • 55
    • 93

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

    • 56
    • 84

    Partly Sunny

    • 56
    • 89

    Mostly Sunny

Today 28 Sep North Bay Interior Valleys

Sunny. Patchy fog in the morning. Highs in the lower 70s to mid 80s. South Winds up to 5 Mph increasing to southwest 10 to 15 Mph in the afternoon.

Tonight 28 Sep North Bay Interior Valleys

Mostly clear. Lows in the 50s. Northwest Winds 5 to 10 Mph.

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Steamboat Slough Temperature Statistics

September Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    66 °F

  • Highest 9 September, 2026

    99.6 °F

Climate (2021–2026)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    70.3 °F
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