Prospect Slough - French Island Weather Forecast

    • 53
    • 58

    Rain Showers

    • 51
    • 57

    Rain Showers

    • 52
    • 54

    Rain Showers

    • 47
    • 53

    Rain Showers

    • 42
    • 51

    Rain Showers Likely

    • 39
    • 48

    Partly Sunny

Today 22 Dec Carquinez Strait and Delta

Rain Showers. Highs around 58. South Winds 10 to 15 Mph. Gusts up to 25 Mph in the morning.

Tonight 22 Dec Carquinez Strait and Delta

Cloudy. Rain Showers in the Evening, then a chance of rain Showers after midnight. Lows around 52. 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

    45.8 °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

    48.6 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    75 °F
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