S
M
T
W
T
F
S
30
76°
60°
31
77°
59°
1
70°
57°
2
67°
56°
3
67°
54°
4
68°
52°
5
71°
58°
6
75°
59°
7
76°
58°
8
76°
58°
9
75°
57°
10
74°
58°
11
74°
57°
12
73°
57°
13
73°
58°
14
69°
44°
15
63°
46°
16
65°
45°
17
66°
47°
18
67°
44°
19
63°
48°
20
63°
49°
21
69°
52°
22
71°
50°
23
70°
42°
24
65°
39°
25
60°
45°
26
67°
49°
27
69°
50°
28
68°
44°
29
63°
39°
30
58°
39°
1
57°
45°
2
62°
47°
3
61°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in L'Île-Dorval
L'Île-Dorval's September 2026 forecast shows daily high temperatures ranging from 57° to 77°, with overnight lows between 39° and 60°. The average high for September is 68° 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 L'Île-Dorval. See also: October | November | December.
