S
M
T
W
T
F
S
31
74°
61°
1
72°
56°
2
65°
52°
3
76°
62°
4
72°
58°
5
73°
54°
6
77°
52°
7
87°
57°
8
74°
61°
9
72°
53°
10
70°
53°
11
70°
55°
12
69°
52°
13
67°
54°
14
69°
51°
15
69°
58°
16
66°
54°
17
74°
54°
18
77°
53°
19
87°
54°
20
71°
64°
21
65°
53°
22
65°
48°
23
59°
49°
24
52°
49°
25
54°
48°
26
57°
48°
27
60°
48°
28
67°
46°
29
68°
47°
30
65°
49°
1
66°
45°
2
65°
46°
3
62°
53°
4
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Longueil-Sainte-Marie
Longueil-Sainte-Marie's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Longueil-Sainte-Marie. See also: October | November | December.
