The temperatures in Brentwood in September are usually low and can range between 12°C and 20°C.
You can expect about 3 to 8 days of rain in Brentwood during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Brentwood in September 2025.
If you’re planning to visit Brentwood in the near future, we highly recommend that you review the 14 day weather forecast for Brentwood before you arrive.
Temperatures
20° / 12°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
46
mm
Sun Hours
9.2
Hrs
