Prospect Slough - French Island Weather Forecast

    • 52
    • 67

    Chance Rain

    • 46
    • 66

    Rain Likely

    • 49
    • 66

    Mostly Sunny

    • 47
    • 76

    Mostly Sunny

    • 49
    • 81

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

Today 31 Mar Carquinez Strait and Delta

Mostly cloudy with a chance of rain. Cooler. Highs around 66. Southwest Winds up to 10 Mph with Gusts to around 20 Mph.

Tonight 31 Mar Carquinez Strait and Delta

Mostly cloudy. A chance of rain in the Evening, then a slight chance of rain after midnight. Lows around 52. Southwest Winds up to 10 Mph with Gusts to around 20 Mph.

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Prospect Slough - French Island Temperature Statistics

March Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 11 March, 2026

    39.9 °F

  • Average March

    62.6 °F

  • Highest 20 March, 2026

    88.3 °F

Climate (2021–Present)

Fairfield / Travis Air Force Base (13.7 miles)

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  • Average Low 2021–2026

    48.8 °F

  • Average 2021–2026

    60.5 °F

  • Average High 2021–2026

    75 °F
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