Steamboat Slough Weather Forecast

    • 51
    • 77

    Increasing Clouds

    • 51
    • 77

    Partly Sunny

    • 51
    • 74

    Partly Sunny

    • 53
    • 80

    Mostly Sunny

    • 53
    • 80

    Partly Sunny

    • 53
    • 78

    Partly Sunny

Today 30 Jun North Bay Interior Valleys

Sunny. Highs in the lower 70s to mid 80s. South Winds 5 to 15 Mph.

Tonight 30 Jun North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 40s to mid 50s. Southwest Winds 5 to 15 Mph.

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Steamboat Slough Temperature Statistics

June Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 7 June, 2026

    45.6 °F

  • Average June

    66 °F

  • Highest 11 June, 2026

    96.7 °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

    58.4 °F

  • Average High 2021–2026

    70.2 °F
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