S
M
T
W
T
F
S
30
81°
58°
31
79°
51°
1
78°
47°
2
71°
48°
3
70°
53°
4
74°
57°
5
76°
55°
6
78°
47°
7
71°
47°
8
72°
50°
9
75°
49°
10
67°
54°
11
75°
54°
12
75°
53°
13
73°
52°
14
66°
48°
15
65°
44°
16
64°
43°
17
64°
51°
18
67°
43°
19
64°
51°
20
69°
52°
21
71°
45°
22
66°
41°
23
63°
42°
24
62°
41°
25
59°
40°
26
59°
40°
27
Hist. Avg.
66°
44°
28
Hist. Avg.
66°
44°
29
Hist. Avg.
66°
43°
30
Hist. Avg.
65°
43°
1
Hist. Avg.
65°
43°
2
Hist. Avg.
65°
42°
3
Hist. Avg.
64°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Montréal-Est
Montréal-Est's September 2026 forecast shows daily high temperatures ranging from 59° to 81°, with overnight lows between 40° and 58°. The average high for September is 70° 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 Montréal-Est. See also: October | November | December.
