S
M
T
W
T
F
S
30
75°
57°
31
71°
54°
1
74°
53°
2
73°
57°
3
76°
62°
4
75°
61°
5
70°
58°
6
73°
56°
7
79°
55°
8
71°
53°
9
69°
52°
10
70°
49°
11
67°
52°
12
70°
62°
13
73°
54°
14
66°
50°
15
69°
58°
16
68°
55°
17
65°
54°
18
63°
51°
19
63°
51°
20
63°
50°
21
62°
52°
22
63°
51°
23
62°
40°
24
67°
50°
25
56°
40°
26
56°
43°
27
57°
49°
28
62°
46°
29
56°
41°
30
58°
48°
1
63°
48°
2
58°
45°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Trois-Rivières
Trois-Rivières's September 2026 forecast shows daily high temperatures ranging from 56° to 73°, with overnight lows between 40° and 62°. The average high for September is 63° 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 Trois-Rivières. See also: October | November | December.
