S
M
T
W
T
F
S
26
62°
33°
27
66°
34°
28
62°
42°
29
51°
39°
30
51°
33°
1
49°
29°
2
43°
28°
3
59°
27°
4
70°
44°
5
60°
45°
6
50°
35°
7
N/A
8
54°
39°
9
59°
36°
10
51°
34°
11
51°
31°
12
53°
38°
13
51°
37°
14
57°
42°
15
58°
45°
16
64°
43°
17
61°
46°
18
68°
51°
19
70°
50°
20
68°
49°
21
69°
53°
22
59°
40°
23
61°
42°
24
62°
43°
25
66°
46°
26
67°
44°
27
62°
43°
28
67°
46°
29
65°
47°
30
71°
50°
31
73°
52°
1
73°
49°
2
68°
48°
3
71°
51°
4
74°
53°
5
74°
54°
6
73°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Guelph
Guelph's May 2026 forecast shows daily high temperatures ranging from 51° to 74°, with overnight lows between 31° and 54°. The average high for May is 64° with an average low of 45°. 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.
