Carquinez Strait - Port Costa Weather Forecast

    • 55
    • 74

    Mostly Sunny

    • 55
    • 77

    Mostly Sunny

    • 56
    • 78

    Mostly Sunny

    • 58
    • 86

    Sunny

    • 58
    • 89

    Mostly Sunny

    • 57
    • 86

    Mostly Sunny

Today 17 Aug East Bay Interior Valleys

Sunny. Highs in the mid 70s to lower 80s. Southwest Winds 10 to 20 Mph.

Tonight 17 Aug East Bay Interior Valleys

Mostly clear. Lows in the upper 50s. Southwest Winds 5 to 15 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Carquinez Strait - Port Costa Temperature Statistics

August Temperature

Concord, Buchanan Field (8.1 miles)

  • Lowest 2 August, 2025

    56.6 °F

  • Average August

    72.2 °F

  • Highest 8 August, 2025

    99.6 °F

Climate (2020–Present)

Concord, Buchanan Field (8.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    50.8 °F

  • Average 2020–2025

    61.4 °F

  • Average High 2020–2025

    74.6 °F
Get WillyWeather+ to remove ads