San Joaquin River - West Island Weather Forecast

    • 63
    • 78

    Sunny

    • 64
    • 81

    Sunny

    • 66
    • 87

    Sunny

    • 67
    • 89

    Sunny

    • 65
    • 89

    Sunny

    • 66
    • 85

    Mostly Sunny

Today 13 Sep Carquinez Strait and Delta

Sunny. Highs 79 to 85. Southwest Winds 10 to 15 Mph with Gusts to around 25 Mph.

Tonight 13 Sep Carquinez Strait and Delta

Clear. Lows 55 to 61. Southwest Winds 10 to 15 Mph with Gusts to around 25 Mph.

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San Joaquin River - West Island Temperature Statistics

September Temperature

Concord, Buchanan Field (14.9 miles)

  • Lowest 4 September, 2025

    59 °F

  • Average September

    70.2 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Concord, Buchanan Field (14.9 miles)

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  • Average Low 2020–2025

    50.8 °F

  • Average 2020–2025

    61.4 °F

  • Average High 2020–2025

    74.6 °F
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