S
M
T
W
T
F
S
26
62°
33°
27
66°
34°
28
63°
43°
29
49°
32°
30
49°
31°
1
46°
30°
2
45°
31°
3
52°
37°
4
53°
41°
5
55°
40°
6
53°
38°
7
53°
38°
8
52°
39°
9
52°
37°
10
55°
38°
11
54°
49°
12
63°
46°
13
66°
38°
14
56°
36°
15
57°
36°
16
58°
38°
17
59°
41°
18
61°
48°
19
66°
41°
20
59°
39°
21
59°
39°
22
60°
40°
23
61°
40°
24
66°
50°
25
70°
46°
26
62°
43°
27
62°
42°
28
63°
47°
29
70°
51°
30
73°
50°
31
67°
49°
1
70°
50°
2
74°
54°
3
75°
52°
4
75°
47°
5
64°
45°
6
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Guelph
Guelph's May 2026 forecast shows daily high temperatures ranging from 45° to 75°, with overnight lows between 30° and 54°. The average high for May is 60° with an average low of 42°. 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 Guelph. See also: June | July | August.
