S
M
T
W
T
F
S
30
72°
67°
31
73°
69°
1
74°
72°
2
76°
71°
3
77°
71°
4
74°
66°
5
75°
63°
6
74°
62°
7
75°
60°
8
76°
66°
9
78°
73°
10
76°
65°
11
71°
59°
12
75°
64°
13
79°
65°
14
67°
56°
15
75°
61°
16
76°
66°
17
73°
57°
18
68°
56°
19
63°
57°
20
65°
52°
21
66°
54°
22
68°
56°
23
72°
60°
24
69°
54°
25
65°
53°
26
66°
56°
27
69°
55°
28
70°
56°
29
67°
42°
30
66°
55°
1
68°
55°
2
62°
53°
3
61°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Port Colborne
Port Colborne's September 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 42° and 66°. 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 Port Colborne. See also: October | November | December.
