Trancas Crossing Park Weather Forecast

    • 57
    • 89

    Increasing Clouds

    • 54
    • 82

    Partly Sunny

    • 53
    • 77

    Partly Sunny

    • 54
    • 79

    Mostly Sunny

    • 53
    • 81

    Partly Sunny

    • 53
    • 75

    Partly Sunny

Today 10 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Highs in the lower 80s to mid 90s. Southwest Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 10 Sep North Bay Interior Valleys

Partly cloudy. Lows in the mid 60s to upper 70s. Southwest Winds up to 5 Mph.

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Trancas Crossing Park Temperature Statistics

September Temperature

Napa, Napa County Airport (8.1 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    64.3 °F

  • Highest 7 September, 2026

    87.1 °F

Climate (2021–2026)

Napa, Napa County Airport (8.1 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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