Monticello Dam Weather Forecast

    • 51
    • 76

    Sunny

    • 53
    • 80

    Sunny

    • 53
    • 78

    Sunny

    • 59
    • 85

    Mostly Sunny

    • 60
    • 87

    Partly Sunny

    • 63
    • 85

    Partly Sunny

Today 4 Sep North Bay Interior Mountains

Sunny. Highs in the lower 60s to mid 70s. West Winds 5 to 10 Mph.

Tonight 4 Sep North Bay Interior Mountains

Mostly clear. Lows in the upper 40s to mid 50s. Northwest Winds 5 to 10 Mph.

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  • Temperature Real-Time

Monticello Dam Temperature Statistics

September Temperature

Vacaville Nut Tree Airport (11.8 miles)

  • Lowest 1 September, 2026

    53.7 °F

  • Average September

    67.3 °F

  • Highest 1 September, 2026

    78.7 °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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