Monticello Dam Weather Forecast

    • 56
    • 86

    Sunny

    • 63
    • 87

    Sunny

    • 65
    • 93

    Sunny

    • 64
    • 95

    Sunny

    • 63
    • 96

    Sunny

    • 61
    • 92

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

Today 13 Sep North Bay Interior Mountains

Sunny. Highs in the lower 70s to mid 80s. Southwest Winds 5 to 10 Mph.

Tonight 13 Sep North Bay Interior Mountains

Clear. Lows in the upper 50s. Northwest Winds 5 to 10 Mph.

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Monticello Dam Temperature Statistics

September Temperature

Vacaville Nut Tree Airport (11.8 miles)

  • Lowest 7 September, 2025

    54 °F

  • Average September

    73 °F

  • Highest 1 September, 2025

    100.9 °F

Climate (2020–Present)

Vacaville Nut Tree Airport (11.8 miles)

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  • Average Low 2020–2025

    49 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    77.2 °F
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