S
M
T
W
T
F
S
30
93°
63°
31
91°
59°
1
87°
54°
2
86°
55°
3
89°
57°
4
88°
59°
5
86°
62°
6
87°
59°
7
86°
58°
8
85°
60°
9
85°
58°
10
87°
58°
11
85°
57°
12
90°
56°
13
89°
58°
14
90°
57°
15
85°
53°
16
82°
56°
17
81°
58°
18
82°
58°
19
85°
59°
20
84°
58°
21
84°
58°
22
86°
59°
23
83°
58°
24
86°
59°
25
87°
59°
26
81°
60°
27
86°
61°
28
87°
59°
29
87°
59°
30
86°
60°
1
87°
59°
2
86°
59°
3
85°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brentwood
Brentwood's September 2026 forecast shows daily high temperatures ranging from 81° to 93°, with overnight lows between 53° and 63°. The average high for September is 86° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Brentwood. See also: October | November | December.
