Mount Diablo State Park Weather Forecast

    • 71
    • 85

    Sunny

    • 70
    • 86

    Mostly Sunny

    • 67
    • 75

    Mostly Cloudy

    • 66
    • 71

    Partly Sunny

    • 66
    • 73

    Mostly Sunny

    • 69
    • 79

    Sunny

Today 16 Sep East Bay Hills

Sunny. Highs in the lower 90s. Light Winds. Becoming southwest 5 to 10 Mph in the afternoon.

Tonight 16 Sep East Bay Hills

Clear. Lows in the upper 60s. Southwest Winds 5 to 10 Mph.

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Mount Diablo State Park Temperature Statistics

September Temperature

Concord, Buchanan Field (10.6 miles)

  • Lowest 4 September, 2025

    59 °F

  • Average September

    69.9 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Concord, Buchanan Field (10.6 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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