S
M
T
W
T
F
S
30
70°
52°
31
75°
55°
1
77°
55°
2
76°
54°
3
70°
52°
4
67°
45°
5
66°
42°
6
67°
42°
7
66°
45°
8
67°
44°
9
66°
52°
10
73°
50°
11
76°
44°
12
67°
41°
13
63°
40°
14
64°
51°
15
68°
49°
16
71°
46°
17
70°
46°
18
69°
49°
19
67°
47°
20
71°
42°
21
69°
36°
22
58°
37°
23
58°
36°
24
57°
36°
25
59°
45°
26
58°
42°
27
64°
38°
28
57°
35°
29
58°
34°
30
57°
39°
1
60°
34°
2
58°
36°
3
58°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint-Leonard
Saint-Leonard's September 2026 forecast shows daily high temperatures ranging from 57° to 77°, with overnight lows between 34° and 55°. The average high for September is 66° with an average low of 44°. 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 Saint-Leonard. See also: October | November | December.
