Prospect Slough - French Island Weather Forecast

    • 39
    • 49

    Mostly Cloudy

    • 38
    • 56

    Partly Sunny

    • 41
    • 56

    Mostly Cloudy

    • 42
    • 54

    Mostly Cloudy

    • 42
    • 59

    Partly Sunny

    • 43
    • 57

    Mostly Cloudy

Today 25 Jan Carquinez Strait and Delta

Patchy fog in the morning. Mostly cloudy. Highs 47 to 53. East Winds up to 10 Mph.

Tonight 25 Jan Carquinez Strait and Delta

Cloudy. Lows around 39. Light Winds.

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Prospect Slough - French Island Temperature Statistics

January Temperature

Fairfield / Travis Air Force Base (13.7 miles)

  • Lowest 14 January, 2026

    32.7 °F

  • Average January

    47.9 °F

  • Highest 3 January, 2026

    63.7 °F

Climate (2021–Present)

Fairfield / Travis Air Force Base (13.7 miles)

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  • Average Low 2021–2026

    48.7 °F

  • Average 2021–2026

    60.4 °F

  • Average High 2021–2026

    74.9 °F
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