S
M
T
W
T
F
S
30
79°
62°
31
77°
68°
1
78°
66°
2
75°
65°
3
85°
70°
4
84°
70°
5
80°
66°
6
73°
60°
7
79°
56°
8
80°
61°
9
79°
62°
10
86°
70°
11
78°
62°
12
76°
57°
13
79°
68°
14
73°
59°
15
71°
52°
16
76°
55°
17
80°
66°
18
80°
67°
19
69°
62°
20
69°
61°
21
69°
59°
22
65°
55°
23
66°
56°
24
65°
53°
25
66°
57°
26
66°
55°
27
69°
53°
28
69°
53°
29
67°
56°
30
68°
56°
1
68°
53°
2
69°
52°
3
66°
56°
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 65° to 69°, with overnight lows between 52° and 61°. The average high for September is 67° with an average low of 55°. 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.
