Brentwood Weather Forecast
- 66
- 97
Hot
- 68
- 98
Hot
- 66
- 90
Chance Rain Showers
- 64
- 86
Chance Rain Showers
- 63
- 89
Mostly Sunny
- 67
- 94
Sunny
- 67
- 95
Partly Sunny
Today 16 Sep East Bay Interior Valleys
Sunny. Highs in the mid 90s. Northwest Winds 5 to 10 Mph.
Tonight 16 Sep East Bay Interior Valleys
Clear. Lows in the mid 60s. West Winds 5 to 10 Mph.
Brentwood Temperature Statistics
September Temperature
Livermore, Livermore Municipal Airport (17.4 miles)
Lowest 8 September, 2025
57.9 °FAverage September
68.7 °FHighest 1 September, 2025
100.9 °F
Climate (2020–Present)
Livermore, Livermore Municipal Airport (17.4 miles)
Average Low 2020–2025
48.7 °FAverage 2020–2025
60.6 °FAverage High 2020–2025
74.2 °F