S
M
T
W
T
F
S
30
60°
46°
31
63°
37°
1
65°
37°
2
67°
40°
3
61°
54°
4
65°
54°
5
56°
46°
6
60°
42°
7
67°
38°
8
55°
33°
9
60°
32°
10
59°
42°
11
55°
36°
12
65°
34°
13
61°
49°
14
53°
33°
15
54°
31°
16
63°
36°
17
58°
35°
18
51°
38°
19
50°
36°
20
54°
31°
21
46°
36°
22
56°
29°
23
60°
29°
24
67°
32°
25
66°
36°
26
64°
43°
27
61°
38°
28
56°
40°
29
59°
39°
30
60°
49°
1
57°
46°
2
56°
39°
3
57°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lac-Jacques-Cartier
Lac-Jacques-Cartier's September 2026 forecast shows daily high temperatures ranging from 56° to 67°, with overnight lows between 32° and 49°. The average high for September is 60° with an average low of 40°. 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 Lac-Jacques-Cartier. See also: October | November | December.
