Black Diamond Mines Regional Preserve Weather Forecast

    • 49
    • 59

    Mostly Cloudy

    • 54
    • 58

    Rain

    • 54
    • 55

    Rain Showers

    • 53
    • 57

    Rain

    • 49
    • 54

    Rain Likely

    • 49
    • 51

    Rain

Today 18 Dec East Bay Interior Valleys

Mostly cloudy. Widespread dense fog in the morning. Highs in the upper 50s. Light Winds. Becoming northwest around 5 Mph in the afternoon.

Tonight 18 Dec East Bay Interior Valleys

Mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. A slight chance of rain in the evening. A chance of rain after midnight. Lows in the upper 40s. Light Winds. Becoming south around 5 Mph after midnight.

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  • Temperature Real-Time

Black Diamond Mines Regional Preserve Temperature Statistics

December Temperature

Concord, Buchanan Field (9.9 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 (9.9 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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