S
M
T
W
T
F
S
30
73°
54°
31
75°
49°
1
76°
47°
2
70°
46°
3
69°
48°
4
73°
56°
5
73°
52°
6
75°
46°
7
69°
47°
8
68°
53°
9
68°
53°
10
72°
52°
11
72°
53°
12
67°
53°
13
68°
49°
14
66°
45°
15
64°
43°
16
64°
43°
17
65°
51°
18
68°
51°
19
70°
49°
20
73°
50°
21
70°
46°
22
68°
43°
23
62°
41°
24
61°
40°
25
60°
39°
26
59°
40°
27
Hist. Avg.
63°
45°
28
Hist. Avg.
63°
45°
29
Hist. Avg.
63°
44°
30
Hist. Avg.
62°
44°
1
Hist. Avg.
62°
44°
2
Hist. Avg.
62°
43°
3
Hist. Avg.
61°
43°
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 59° to 76°, with overnight lows between 39° and 56°. The average high for September is 69° with an average low of 48°. 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.
