S
M
T
W
T
F
S
26
58°
43°
27
65°
45°
28
56°
46°
29
51°
39°
30
46°
36°
1
45°
36°
2
46°
36°
3
49°
43°
4
53°
42°
5
51°
44°
6
55°
46°
7
49°
40°
8
51°
41°
9
52°
42°
10
52°
44°
11
54°
45°
12
55°
53°
13
59°
42°
14
60°
45°
15
60°
43°
16
59°
44°
17
60°
48°
18
63°
52°
19
66°
51°
20
66°
52°
21
69°
53°
22
67°
50°
23
64°
52°
24
68°
47°
25
62°
46°
26
64°
54°
27
64°
54°
28
70°
55°
29
68°
54°
30
66°
51°
31
68°
47°
1
64°
48°
2
64°
48°
3
65°
48°
4
65°
49°
5
66°
50°
6
66°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Port Colborne
Port Colborne's May 2026 forecast shows daily high temperatures ranging from 45° to 70°, with overnight lows between 36° and 55°. The average high for May is 60° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Port Colborne. See also: June | July | August.
