Prospect Slough - French Island Weather Forecast

    • 63
    • 98

    Hot

    • 63
    • 98

    Hot

    • 64
    • 99

    Hot

    • 60
    • 92

    Mostly Sunny

    • 60
    • 92

    Mostly Sunny

    • 59
    • 89

    Mostly Sunny

    • 60
    • 87

    Partly Sunny

Today 30 Aug Carquinez Strait and Delta

Sunny. Highs 93 to 99. West Winds around 10 Mph with Gusts to around 20 Mph.

Tonight 30 Aug Carquinez Strait and Delta

Clear. Lows 59 to 67. West Winds 10 to 15 Mph.

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Prospect Slough - French Island Temperature Statistics

August Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 18 August, 2025

    56.3 °F

  • Average August

    73.2 °F

  • Highest 21 August, 2025

    104 °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

    60.5 °F

  • Average High 2020–2025

    75.5 °F
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