S
M
T
W
T
F
S
30
89°
58°
31
81°
56°
1
77°
54°
2
82°
57°
3
75°
57°
4
80°
54°
5
84°
56°
6
84°
56°
7
91°
58°
8
90°
61°
9
93°
65°
10
95°
62°
11
95°
62°
12
89°
61°
13
88°
58°
14
87°
59°
15
87°
61°
16
83°
60°
17
89°
61°
18
88°
58°
19
81°
56°
20
84°
61°
21
85°
58°
22
87°
58°
23
81°
59°
24
79°
54°
25
78°
54°
26
77°
55°
27
78°
54°
28
78°
54°
29
79°
55°
30
78°
58°
1
77°
54°
2
78°
56°
3
84°
60°
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 75° to 95°, with overnight lows between 54° and 65°. The average high for September is 84° 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.
