S
M
T
W
T
F
S
30
74°
46°
31
71°
42°
1
71°
46°
2
72°
56°
3
70°
58°
4
66°
59°
5
67°
52°
6
74°
49°
7
79°
44°
8
69°
46°
9
66°
44°
10
69°
51°
11
64°
43°
12
72°
39°
13
70°
52°
14
62°
41°
15
62°
40°
16
72°
51°
17
68°
46°
18
63°
38°
19
60°
36°
20
58°
43°
21
61°
38°
22
61°
37°
23
66°
36°
24
72°
44°
25
72°
48°
26
68°
53°
27
65°
50°
28
60°
48°
29
60°
48°
30
64°
54°
1
68°
50°
2
67°
49°
3
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lac-Saint-Charles
Lac-Saint-Charles's September 2026 forecast shows daily high temperatures ranging from 60° to 72°, with overnight lows between 44° and 54°. The average high for September is 66° 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 Lac-Saint-Charles. See also: October | November | December.
