Trancas Crossing Park Weather Forecast

    • 52
    • 73

    Areas Fog

    • 54
    • 82

    Mostly Sunny

    • 54
    • 86

    Partly Sunny

    • 53
    • 78

    Partly Sunny

    • 53
    • 80

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

Today 17 Sep North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. A slight chance of drizzle in the morning. Highs in the mid 60s to upper 70s. South Winds 5 to 15 Mph.

Tonight 17 Sep North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Trancas Crossing Park Temperature Statistics

September Temperature

Napa, Napa County Airport (8.1 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    67.1 °F

  • Highest 9 September, 2026

    99.6 °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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