Prospect Slough - French Island Weather Forecast

    • 37
    • 51

    Partly Sunny

    • 44
    • 48

    Mostly Cloudy

    • 47
    • 48

    Rain

    • 52
    • 54

    Rain

    • 49
    • 56

    Rain Likely

    • 46
    • 53

    Rain Likely

    • 47
    • 52

    Chance Rain

Today 29 Dec Carquinez Strait and Delta

Widespread fog and Areas of frost in the morning. Mostly cloudy. Highs 52 to 58. Northeast Winds up to 10 Mph.

Tonight 29 Dec Carquinez Strait and Delta

Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows around 38. Light Winds.

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Prospect Slough - French Island Temperature Statistics

December Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 4 December, 2025

    35.2 °F

  • Average December

    48.5 °F

  • Highest 17 December, 2025

    65.3 °F

Climate (2020–Present)

Fairfield / Travis Air Force Base (13.7 miles)

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  • Average Low 2020–2025

    48.7 °F

  • Average 2020–2025

    60.5 °F

  • Average High 2020–2025

    75 °F
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