S
M
T
W
T
F
S
30
58°
41°
31
59°
42°
1
60°
49°
2
65°
49°
3
66°
47°
4
60°
48°
5
56°
47°
6
64°
45°
7
56°
41°
8
55°
39°
9
60°
38°
10
63°
45°
11
63°
45°
12
60°
44°
13
54°
46°
14
61°
48°
15
64°
46°
16
62°
47°
17
60°
46°
18
56°
45°
19
59°
42°
20
57°
42°
21
58°
35°
22
52°
33°
23
48°
34°
24
49°
36°
25
54°
32°
26
48°
30°
27
47°
31°
28
47°
35°
29
50°
31°
30
45°
30°
1
46°
30°
2
43°
28°
3
43°
29°
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 43° to 66°, with overnight lows between 28° and 49°. The average high for September is 56° 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.
