Monticello Dam Weather Forecast

    • 67
    • 96

    Becoming Sunny

    • 60
    • 88

    Sunny

    • 59
    • 90

    Sunny

    • 59
    • 93

    Sunny

    • 59
    • 94

    Sunny

    • 60
    • 94

    Sunny

Today 21 Jul North Bay Interior Mountains

Partly cloudy. A slight chance of Showers. Highs in the upper 70s to lower 90s. West Winds 5 to 10 Mph.

Tonight 21 Jul North Bay Interior Mountains

Partly cloudy. Lows in the 60s. Northwest Winds up to 5 Mph.

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Monticello Dam Temperature Statistics

July Temperature

Vacaville Nut Tree Airport (11.8 miles)

  • Lowest 8 July, 2026

    54.6 °F

  • Average July

    77.2 °F

  • Highest 14 July, 2026

    106.6 °F

Climate (2021–2026)

Vacaville Nut Tree Airport (11.8 miles)

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  • Average Low 2021–2026

    49.3 °F

  • Average 2021–2026

    62.9 °F

  • Average High 2021–2026

    76.9 °F
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