S
M
T
W
T
F
S
30
63°
52°
31
72°
52°
1
74°
51°
2
66°
55°
3
67°
52°
4
66°
47°
5
71°
53°
6
70°
51°
7
70°
56°
8
70°
53°
9
70°
51°
10
69°
52°
11
64°
49°
12
71°
52°
13
71°
54°
14
67°
48°
15
69°
52°
16
71°
47°
17
70°
47°
18
65°
48°
19
64°
47°
20
65°
45°
21
66°
46°
22
68°
51°
23
65°
46°
24
60°
46°
25
59°
43°
26
60°
42°
27
62°
45°
28
62°
50°
29
61°
45°
30
60°
48°
1
62°
45°
2
60°
46°
3
59°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brentwood Bay
Brentwood Bay's September 2026 forecast shows daily high temperatures ranging from 59° to 62°, with overnight lows between 42° and 50°. The average high for September is 61° with an average low of 46°. 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 Bay. See also: October | November | December.
