Prospect Slough - French Island Weather Forecast

    • 55
    • 85

    Sunny

    • 56
    • 88

    Sunny

    • 56
    • 84

    Sunny

    • 57
    • 83

    Sunny

    • 60
    • 89

    Sunny

    • 62
    • 98

    Hot

    • 59
    • 95

    Sunny

Today 5 Jul Carquinez Strait and Delta

Sunny. Highs 79 to 85. West Winds 10 to 15 Mph.

Tonight 5 Jul Carquinez Strait and Delta

Clear. Lows around 54. Southwest Winds 10 to 15 Mph with Gusts to around 25 Mph.

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Prospect Slough - French Island Temperature Statistics

July Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 1 July, 2025

    55.6 °F

  • Average July

    69 °F

  • Highest 1 July, 2025

    90.5 °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

    60.6 °F

  • Average High 2020–2025

    75.6 °F
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