S
M
T
W
T
F
S
30
75°
52°
31
75°
49°
1
76°
55°
2
75°
54°
3
81°
62°
4
76°
59°
5
71°
54°
6
74°
51°
7
80°
51°
8
73°
52°
9
71°
52°
10
73°
55°
11
67°
50°
12
76°
46°
13
78°
64°
14
67°
45°
15
65°
40°
16
78°
55°
17
70°
53°
18
69°
44°
19
63°
38°
20
64°
44°
21
61°
42°
22
64°
39°
23
69°
43°
24
71°
38°
25
73°
44°
26
70°
52°
27
65°
49°
28
59°
48°
29
63°
48°
30
70°
57°
1
70°
54°
2
69°
51°
3
67°
52°
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 59° to 73°, with overnight lows between 38° and 57°. The average high for September is 68° with an average low of 49°. 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.
