S
M
T
W
T
F
S
26
81°
56°
27
82°
56°
28
79°
62°
29
77°
56°
30
82°
53°
31
86°
49°
1
84°
65°
2
69°
60°
3
77°
51°
4
80°
47°
5
83°
49°
6
82°
58°
7
78°
65°
8
83°
58°
9
80°
54°
10
81°
64°
11
79°
58°
12
76°
57°
13
77°
53°
14
78°
56°
15
75°
58°
16
76°
57°
17
72°
54°
18
75°
56°
19
76°
56°
20
74°
55°
21
72°
56°
22
76°
54°
23
71°
53°
24
71°
52°
25
70°
49°
26
78°
59°
27
77°
58°
28
69°
52°
29
71°
57°
30
75°
57°
31
77°
56°
1
77°
58°
2
78°
57°
3
77°
57°
4
74°
56°
5
73°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Guelph
Guelph's August 2026 forecast shows daily high temperatures ranging from 69° to 78°, with overnight lows between 49° and 59°. The average high for August is 75° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Guelph. See also: September | October | November.
