Carquinez Strait - Port Costa Weather Forecast

    • 38
    • 55

    Increasing Clouds

    • 39
    • 55

    Mostly Sunny

    • 41
    • 57

    Mostly Sunny

    • 43
    • 58

    Mostly Sunny

    • 44
    • 60

    Mostly Sunny

    • 45
    • 60

    Partly Sunny

Today 11 Jan East Bay Interior Valleys

Partly cloudy. Areas of frost and patchy dense fog in the morning. Highs in the upper 50s. Northeast Winds around 5 Mph.

Tonight 11 Jan East Bay Interior Valleys

Partly cloudy. Lows in the upper 30s. Light Winds.

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Carquinez Strait - Port Costa Temperature Statistics

January Temperature

Concord, Buchanan Field (8.1 miles)

  • Lowest 8 January, 2026

    39.9 °F

  • Average January

    53.5 °F

  • Highest 3 January, 2026

    64 °F

Climate (2021–Present)

Concord, Buchanan Field (8.1 miles)

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  • Average Low 2021–2026

    50.9 °F

  • Average 2021–2026

    61.3 °F

  • Average High 2021–2026

    74.2 °F
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