S
M
T
W
T
F
S
30
76°
57°
31
77°
56°
1
69°
54°
2
67°
54°
3
68°
52°
4
69°
51°
5
72°
55°
6
75°
56°
7
76°
55°
8
76°
55°
9
75°
56°
10
73°
55°
11
74°
55°
12
75°
54°
13
73°
56°
14
66°
42°
15
64°
43°
16
65°
43°
17
69°
45°
18
67°
42°
19
64°
45°
20
63°
46°
21
69°
50°
22
71°
48°
23
70°
40°
24
66°
38°
25
60°
44°
26
68°
47°
27
69°
48°
28
68°
42°
29
62°
36°
30
59°
36°
1
58°
43°
2
62°
43°
3
61°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mont-Saint-Hilaire
Mont-Saint-Hilaire's September 2026 forecast shows daily high temperatures ranging from 58° to 77°, with overnight lows between 36° and 57°. The average high for September is 68° 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 Mont-Saint-Hilaire. See also: October | November | December.
