S
M
T
W
T
F
S
26
54°
25°
27
50°
34°
28
48°
28°
29
55°
27°
30
54°
28°
1
55°
25°
2
72°
34°
3
72°
37°
4
55°
34°
5
45°
28°
6
46°
27°
7
63°
23°
8
68°
32°
9
57°
36°
10
57°
30°
11
75°
32°
12
72°
48°
13
79°
56°
14
84°
50°
15
82°
46°
16
77°
49°
17
56°
43°
18
52°
39°
19
56°
40°
20
65°
41°
21
66°
45°
22
74°
51°
23
74°
49°
24
78°
55°
25
78°
52°
26
71°
48°
27
65°
48°
28
66°
49°
29
66°
51°
30
68°
51°
31
68°
46°
1
69°
51°
2
70°
56°
3
74°
57°
4
79°
58°
5
80°
57°
6
76°
56°
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 52° to 84°, with overnight lows between 39° and 58°. The average high for May is 71° with an average low of 50°. 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.
