S
M
T
W
T
F
S
30
78°
50°
31
70°
50°
1
70°
58°
2
75°
58°
3
68°
50°
4
68°
57°
5
69°
50°
6
71°
50°
7
70°
49°
8
68°
48°
9
67°
48°
10
68°
50°
11
67°
46°
12
65°
48°
13
66°
47°
14
69°
52°
15
71°
44°
16
64°
43°
17
61°
42°
18
62°
43°
19
61°
44°
20
62°
44°
21
63°
45°
22
64°
43°
23
65°
50°
24
69°
50°
25
69°
49°
26
68°
51°
27
68°
41°
28
64°
39°
29
58°
40°
30
58°
48°
1
60°
49°
2
63°
49°
3
65°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Laval
Laval's September 2026 forecast shows daily high temperatures ranging from 58° to 78°, with overnight lows between 39° and 58°. The average high for September is 66° 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 Laval. See also: October | November | December.
