S
M
T
W
T
F
S
30
73°
58°
31
77°
58°
1
78°
57°
2
77°
56°
3
68°
52°
4
66°
46°
5
67°
45°
6
66°
44°
7
67°
53°
8
69°
56°
9
73°
55°
10
77°
50°
11
76°
44°
12
64°
44°
13
63°
43°
14
65°
55°
15
73°
55°
16
73°
54°
17
72°
54°
18
73°
53°
19
74°
51°
20
73°
42°
21
70°
40°
22
59°
39°
23
59°
38°
24
60°
47°
25
67°
48°
26
69°
42°
27
65°
38°
28
58°
37°
29
57°
39°
30
60°
41°
1
61°
41°
2
62°
45°
3
64°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in L'Assomption
L'Assomption's September 2026 forecast shows daily high temperatures ranging from 57° to 78°, with overnight lows between 37° and 58°. The average high for September is 68° with an average low of 48°. 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 L'Assomption. See also: October | November | December.
