Milliken Reservoir Weather Forecast

    • 64
    • 85

    Sunny

    • 59
    • 88

    Mostly Sunny

    • 61
    • 85

    Mostly Sunny

    • 59
    • 83

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

Today 20 Aug North Bay Interior Mountains

Sunny. Highs in the lower 80s to mid 90s. North Winds 5 to 10 Mph. Becoming west 10 to 15 Mph in the afternoon.

Tonight 20 Aug North Bay Interior Mountains

Clear. Lows in the mid 60s to lower 70s. Northwest Winds 10 to 20 Mph. Becoming north 5 to 10 Mph after midnight.

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Milliken Reservoir Temperature Statistics

August Temperature

Napa, Napa County Airport (11.8 miles)

  • Lowest 18 August, 2025

    50 °F

  • Average August

    66.9 °F

  • Highest 6 August, 2025

    88.6 °F

Climate (2020–Present)

Napa, Napa County Airport (11.8 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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