Napa River - Mud Slough Entrance Weather Forecast

    • 61
    • 87

    Increasing Clouds

    • 62
    • 72

    Chance Rain Showers

    • 60
    • 74

    Chance Rain Showers

    • 59
    • 77

    Mostly Sunny

    • 61
    • 80

    Mostly Sunny

    • 62
    • 85

    Mostly Sunny

    • 61
    • 73

    Chance Rain Showers

Today 17 Sep North Bay Interior Valleys

Sunny. Highs in the lower 80s to mid 90s. Southwest Winds up to 5 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 17 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 50s to mid 60s. Southwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Napa River - Mud Slough Entrance Temperature Statistics

September Temperature

Napa, Napa County Airport (1.9 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    66.1 °F

  • Highest 15 September, 2025

    91 °F

Climate (2020–Present)

Napa, Napa County Airport (1.9 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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