Prospect Slough - French Island Weather Forecast

    • 53
    • 78

    Sunny

    • 56
    • 79

    Mostly Sunny

    • 52
    • 70

    Partly Sunny

    • 52
    • 71

    Partly Sunny

    • 56
    • 70

    Chance Rain Showers

    • 55
    • 67

    Rain Showers Likely

Today 20 Oct Carquinez Strait and Delta

Sunny. Highs 75 to 81. North Winds 10 to 15 Mph with Gusts to around 30 Mph.

Tonight 20 Oct Carquinez Strait and Delta

Clear. Lows 51 to 57. Light Winds.

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Prospect Slough - French Island Temperature Statistics

October Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 17 October, 2025

    43.9 °F

  • Average October

    63.1 °F

  • Highest 7 October, 2025

    91.9 °F

Climate (2020–Present)

Fairfield / Travis Air Force Base (13.7 miles)

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  • Average Low 2020–2025

    48.4 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    75.2 °F
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