Prospect Slough - French Island Weather Forecast

    • 65
    • 96

    Mostly Sunny

    • 64
    • 86

    Chance Rain Showers

    • 62
    • 81

    Chance Rain Showers

    • 62
    • 88

    Mostly Sunny

    • 64
    • 91

    Sunny

    • 65
    • 94

    Partly Sunny

Today 17 Sep Carquinez Strait and Delta

Sunny. Highs 92 to 98. West Winds up to 10 Mph with Gusts to around 20 Mph.

Tonight 17 Sep Carquinez Strait and Delta

Partly cloudy. Lows 62 to 68. West Winds 10 to 15 Mph.

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Prospect Slough - French Island Temperature Statistics

September Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 4 September, 2025

    57.4 °F

  • Average September

    69 °F

  • Highest 3 September, 2025

    92.5 °F

Climate (2020–Present)

Fairfield / Travis Air Force Base (13.7 miles)

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  • Average Low 2020–2025

    48.5 °F

  • Average 2020–2025

    60.5 °F

  • Average High 2020–2025

    75.5 °F
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