S
M
T
W
T
F
S
30
76°
49°
31
75°
54°
1
75°
56°
2
76°
57°
3
75°
56°
4
76°
57°
5
76°
56°
6
74°
53°
7
74°
55°
8
73°
54°
9
74°
55°
10
75°
54°
11
75°
53°
12
74°
55°
13
73°
51°
14
71°
52°
15
62°
53°
16
68°
51°
17
63°
51°
18
64°
43°
19
66°
39°
20
57°
42°
21
59°
43°
22
60°
39°
23
57°
41°
24
57°
45°
25
61°
48°
26
63°
48°
27
62°
45°
28
60°
39°
29
60°
41°
30
63°
47°
1
64°
46°
2
64°
47°
3
61°
40°
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 57° to 76°, with overnight lows between 39° 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 Trois-Rivières. See also: October | November | December.
