S
M
T
W
T
F
S
30
63°
50°
31
62°
55°
1
63°
52°
2
61°
51°
3
63°
51°
4
66°
55°
5
60°
49°
6
61°
49°
7
62°
50°
8
62°
48°
9
61°
50°
10
61°
49°
11
62°
52°
12
66°
54°
13
67°
53°
14
68°
51°
15
67°
56°
16
68°
58°
17
68°
54°
18
67°
49°
19
64°
46°
20
66°
56°
21
65°
46°
22
59°
51°
23
60°
53°
24
56°
53°
25
56°
51°
26
56°
50°
27
55°
47°
28
55°
47°
29
56°
52°
30
55°
54°
1
56°
52°
2
57°
45°
3
56°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Boundary Bay
Boundary Bay's September 2026 forecast shows daily high temperatures ranging from 55° to 68°, with overnight lows between 43° and 58°. The average high for September is 61° with an average low of 51°. 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 Boundary Bay. See also: October | November | December.
