Brentwood Weather Forecast

    • 49
    • 61

    Decreasing Clouds

    • 54
    • 60

    Rain

    • 56
    • 56

    Rain Showers

    • 55
    • 59

    Rain

    • 50
    • 56

    Rain Likely

    • 49
    • 52

    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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Brentwood Temperature Statistics

December Temperature

Livermore, Livermore Municipal Airport (17.4 miles)

  • Lowest 14 December, 2025

    34 °F

  • Average December

    43.4 °F

  • Highest 2 December, 2025

    63 °F

Climate (2020–Present)

Livermore, Livermore Municipal Airport (17.4 miles)

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  • Average Low 2020–2025

    48.8 °F

  • Average 2020–2025

    60.6 °F

  • Average High 2020–2025

    73.9 °F
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