Steamboat Slough Weather Forecast

    • 58
    • 89

    Sunny

    • 57
    • 91

    Sunny

    • 58
    • 91

    Mostly Sunny

    • 59
    • 81

    Chance Rain Showers

    • 58
    • 80

    Slight Chance Rain Showers

    • 57
    • 81

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

Today 15 Sep North Bay Interior Valleys

Sunny. Highs in the 80s to 90s. Southwest Winds 5 to 10 Mph.

Tonight 15 Sep North Bay Interior Valleys

Clear. Lows in the lower 50s to mid 60s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steamboat Slough Temperature Statistics

September Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 3 September, 2025

    52 °F

  • Average September

    65.7 °F

  • Highest 1 September, 2025

    89.1 °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

    70.5 °F
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