Milliken Reservoir Weather Forecast

    • 56
    • 78

    Becoming Sunny

    • 51
    • 73

    Mostly Sunny

    • 47
    • 69

    Mostly Sunny

    • 47
    • 63

    Mostly Sunny

    • 56
    • 73

    Sunny

    • 58
    • 78

    Mostly Sunny

Today 24 Sep North Bay Interior Mountains

Partly cloudy. Highs in the 70s to upper 80s. Southwest Winds 5 to 10 Mph.

Tonight 24 Sep North Bay Interior Mountains

Mostly cloudy in the evening then becoming partly cloudy. Lows in the upper 50s to mid 60s. Northwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Milliken Reservoir Temperature Statistics

September Temperature

Napa, Napa County Airport (11.8 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    65.5 °F

  • Highest 9 September, 2026

    99.6 °F

Climate (2021–2026)

Napa, Napa County Airport (11.8 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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