Brentwood Weather Forecast

    • 58
    • 83

    Decreasing Clouds

    • 58
    • 85

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

    • 64
    • 97

    Hot

    • 61
    • 91

    Mostly Sunny

Today 20 Sep East Bay Interior Valleys

Mostly cloudy. Highs near 80. West Winds 5 to 10 Mph.

Tonight 20 Sep East Bay Interior Valleys

Mostly cloudy. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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Brentwood Temperature Statistics

September Temperature

Livermore, Livermore Municipal Airport (17.4 miles)

  • Lowest 5 September, 2026

    50.6 °F

  • Average September

    70.3 °F

  • Highest 9 September, 2026

    104.6 °F

Climate (2021–2026)

Livermore, Livermore Municipal Airport (17.4 miles)

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  • Average Low 2021–2026

    49 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    74.1 °F
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