Swanzy Reservoir Weather Forecast

    • 57
    • 79

    Mostly Sunny

    • 58
    • 81

    Partly Sunny

    • 57
    • 73

    Mostly Cloudy

    • 57
    • 74

    Partly Sunny

    • 58
    • 78

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

Today 18 Sep Southwestern Solano County Including Vallejo

Mostly sunny. Highs 79 to 89.

Tonight 18 Sep Southwestern Solano County Including Vallejo

Clear. Lows around 58. Southwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Swanzy Reservoir Temperature Statistics

September Temperature

Napa, Napa County Airport (9.3 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    66.6 °F

  • Highest 9 September, 2026

    99.6 °F

Climate (2021–2026)

Napa, Napa County Airport (9.3 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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