Napa River - Mud Slough Entrance Weather Forecast

    • 54
    • 67

    Increasing Clouds

    • 52
    • 65

    Partly Sunny

    • 56
    • 74

    Mostly Sunny

    • 57
    • 83

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

Today 26 Sep North Bay Interior Valleys

Mostly cloudy. Patchy fog in the morning. Highs in the 60s to 70s. South Winds 5 to 10 Mph.

Tonight 26 Sep North Bay Interior Valleys

Mostly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest Winds 5 to 10 Mph.

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Napa River - Mud Slough Entrance Temperature Statistics

September Temperature

Napa, Napa County Airport (1.9 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 (1.9 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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