Napa River - Horseshoe Bend Weather Forecast

    • 56
    • 78

    Becoming Sunny

    • 58
    • 78

    Partly Sunny

    • 57
    • 76

    Partly Sunny

    • 55
    • 76

    Partly Sunny

    • 55
    • 77

    Partly Sunny

    • 55
    • 78

    Mostly Sunny

Today 6 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Highs in the upper 60s to mid 80s. West Winds 5 to 10 Mph becoming southwest 10 to 20 Mph in the afternoon.

Tonight 6 Sep North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the 50s to lower 60s. West Winds 5 to 15 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Napa River - Horseshoe Bend Temperature Statistics

September Temperature

Napa, Napa County Airport (2.5 miles)

  • Lowest 3 September, 2025

    52 °F

  • Average September

    67.8 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

Napa, Napa County Airport (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
Get WillyWeather+ to remove ads