Mount Diablo State Park Weather Forecast

    • 47
    • 57

    Partly Sunny

    • 49
    • 57

    Chance Rain

    • 55
    • 59

    Rain

    • 55
    • 59

    Rain

    • 53
    • 61

    Rain

    • 50
    • 58

    Rain Likely

    • 51
    • 53

    Rain Likely

Today 17 Dec East Bay Hills

Partly cloudy. Highs around 60. West Winds 5 to 10 Mph.

Tonight 17 Dec East Bay Hills

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 40s. Southwest Winds around 5 Mph.

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Mount Diablo State Park Temperature Statistics

December Temperature

Concord, Buchanan Field (10.6 miles)

  • Lowest 4 December, 2025

    37.9 °F

  • Average December

    44.2 °F

  • Highest 3 December, 2025

    64.9 °F

Climate (2020–Present)

Concord, Buchanan Field (10.6 miles)

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  • Average Low 2020–2025

    50.8 °F

  • Average 2020–2025

    61.2 °F

  • Average High 2020–2025

    74.2 °F
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