Greenbriar Weather Forecast

    • 58
    • 72

    Mostly Sunny

    • 58
    • 79

    Mostly Sunny

    • 60
    • 85

    Sunny

    • 59
    • 87

    Sunny

    • 59
    • 82

    Sunny

    • 58
    • 78

    Mostly Sunny

Today 13 Sep East Bay Interior Valleys

Sunny. Highs in the mid 80s. Southwest Winds 5 to 15 Mph.

Tonight 13 Sep East Bay Interior Valleys

Mostly clear. Lows around 60. Southwest Winds 5 to 15 Mph.

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Greenbriar Temperature Statistics

September Temperature

Concord, Buchanan Field (11.8 miles)

  • Lowest 4 September, 2025

    59 °F

  • Average September

    70.2 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Concord, Buchanan Field (11.8 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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