S
M
T
W
T
F
S
30
74°
58°
31
75°
51°
1
75°
49°
2
68°
47°
3
Hist. Avg.
73°
52°
4
Hist. Avg.
72°
51°
5
Hist. Avg.
72°
51°
6
Hist. Avg.
72°
51°
7
Hist. Avg.
71°
50°
8
Hist. Avg.
71°
50°
9
Hist. Avg.
71°
50°
10
Hist. Avg.
70°
49°
11
Hist. Avg.
70°
49°
12
Hist. Avg.
70°
49°
13
Hist. Avg.
69°
48°
14
Hist. Avg.
69°
48°
15
Hist. Avg.
69°
48°
16
Hist. Avg.
68°
47°
17
Hist. Avg.
68°
47°
18
Hist. Avg.
68°
47°
19
Hist. Avg.
67°
46°
20
Hist. Avg.
67°
46°
21
Hist. Avg.
66°
46°
22
Hist. Avg.
66°
45°
23
Hist. Avg.
66°
45°
24
Hist. Avg.
65°
45°
25
Hist. Avg.
65°
44°
26
Hist. Avg.
65°
44°
27
Hist. Avg.
64°
44°
28
Hist. Avg.
64°
44°
29
Hist. Avg.
64°
43°
30
Hist. Avg.
63°
43°
1
Hist. Avg.
63°
43°
2
Hist. Avg.
62°
42°
3
Hist. Avg.
62°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Montreal
Montreal's September 2026 forecast shows daily high temperatures ranging from 68° to 75°, with overnight lows between 47° and 58°. The average high for September is 73° 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 Montreal. See also: October | November | December.
