S
M
T
W
T
F
S
30
69°
58°
31
78°
52°
1
74°
55°
2
71°
59°
3
71°
56°
4
67°
50°
5
77°
55°
6
77°
51°
7
64°
54°
8
75°
59°
9
76°
53°
10
74°
58°
11
71°
52°
12
77°
54°
13
71°
56°
14
67°
52°
15
74°
50°
16
80°
52°
17
83°
53°
18
82°
54°
19
76°
55°
20
70°
52°
21
70°
54°
22
69°
53°
23
71°
51°
24
72°
53°
25
61°
46°
26
61°
52°
27
62°
49°
28
60°
49°
29
60°
50°
30
59°
47°
1
59°
48°
2
60°
47°
3
58°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Downtown Port Coquitlam
Downtown Port Coquitlam's September 2026 forecast shows daily high temperatures ranging from 58° to 83°, with overnight lows between 44° and 56°. The average high for September is 68° 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 Downtown Port Coquitlam. See also: October | November | December.
