S
M
T
W
T
F
S
30
68°
46°
31
68°
48°
1
70°
54°
2
76°
56°
3
72°
58°
4
70°
58°
5
79°
54°
6
75°
50°
7
67°
46°
8
68°
46°
9
71°
45°
10
73°
51°
11
74°
50°
12
65°
50°
13
72°
54°
14
75°
54°
15
76°
52°
16
72°
53°
17
66°
52°
18
69°
51°
19
69°
46°
20
64°
50°
21
70°
41°
22
64°
39°
23
61°
39°
24
61°
41°
25
64°
40°
26
60°
38°
27
59°
39°
28
59°
42°
29
58°
37°
30
58°
40°
1
59°
39°
2
60°
36°
3
56°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint-Denis-sur-Richelieu
Saint-Denis-sur-Richelieu's September 2026 forecast shows daily high temperatures ranging from 56° to 79°, with overnight lows between 36° and 58°. The average high for September is 67° with an average low of 47°. 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 Saint-Denis-sur-Richelieu. See also: October | November | December.
