S
M
T
W
T
F
S
30
68°
63°
31
75°
64°
1
86°
67°
2
84°
65°
3
81°
62°
4
72°
58°
5
76°
56°
6
75°
54°
7
N/A
8
75°
61°
9
76°
60°
10
70°
47°
11
69°
50°
12
74°
58°
13
74°
56°
14
71°
58°
15
70°
48°
16
65°
46°
17
63°
47°
18
61°
45°
19
61°
46°
20
62°
45°
21
61°
40°
22
61°
50°
23
63°
51°
24
66°
51°
25
69°
50°
26
69°
48°
27
63°
49°
28
68°
49°
29
69°
51°
30
70°
51°
1
69°
50°
2
66°
47°
3
66°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Guelph
Guelph's September 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 40° and 61°. The average high for September is 67° 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 September weather will actually feel in Guelph. See also: October | November | December.
