Vacaville Weather Forecast

    • 61
    • 85

    Becoming Sunny

    • 65
    • 82

    Mostly Sunny

    • 62
    • 81

    Chance Rain Showers

    • 62
    • 81

    Chance Rain Showers

    • 61
    • 81

    Mostly Sunny

    • 61
    • 86

    Sunny

Today 7 Sep Southern Sacramento Valley

Mostly sunny. Highs 82 to 88. South Winds up to 10 Mph.

Tonight 7 Sep Southern Sacramento Valley

Mostly clear. Lows 56 to 62. South Winds up to 10 Mph with Gusts to around 20 Mph.

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Vacaville Temperature Statistics

September Temperature

Vacaville Nut Tree Airport (1.9 miles)

  • Lowest 5 September, 2025

    55.9 °F

  • Average September

    76.2 °F

  • Highest 1 September, 2025

    100.9 °F

Climate (2020–Present)

Vacaville Nut Tree Airport (1.9 miles)

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  • Average Low 2020–2025

    49 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    77.3 °F
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