S
M
T
W
T
F
S
30
72°
66°
31
71°
66°
1
81°
68°
2
82°
67°
3
80°
57°
4
76°
55°
5
73°
53°
6
73°
53°
7
74°
57°
8
75°
59°
9
75°
59°
10
69°
50°
11
67°
51°
12
74°
55°
13
73°
55°
14
76°
54°
15
73°
55°
16
74°
48°
17
73°
50°
18
65°
46°
19
70°
48°
20
72°
53°
21
73°
53°
22
72°
52°
23
70°
51°
24
66°
51°
25
70°
52°
26
69°
50°
27
66°
45°
28
59°
47°
29
59°
46°
30
58°
42°
1
57°
44°
2
57°
48°
3
63°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in East Gwillimbury
East Gwillimbury's September 2026 forecast shows daily high temperatures ranging from 57° to 80°, with overnight lows between 42° and 59°. The average high for September is 69° with an average low of 51°. 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 East Gwillimbury. See also: October | November | December.
