S
M
T
W
T
F
S
30
68°
55°
31
73°
56°
1
73°
58°
2
72°
56°
3
72°
53°
4
66°
51°
5
67°
50°
6
68°
55°
7
71°
54°
8
70°
54°
9
65°
47°
10
64°
45°
11
64°
40°
12
60°
42°
13
63°
44°
14
62°
43°
15
60°
42°
16
61°
41°
17
62°
39°
18
61°
41°
19
60°
41°
20
59°
42°
21
60°
40°
22
62°
48°
23
66°
44°
24
64°
46°
25
64°
50°
26
70°
49°
27
68°
45°
28
65°
42°
29
58°
41°
30
57°
40°
1
55°
46°
2
65°
48°
3
68°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lachute
Lachute's September 2026 forecast shows daily high temperatures ranging from 55° to 73°, with overnight lows between 35° and 58°. The average high for September is 65° with an average low of 46°. 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 Lachute. See also: October | November | December.
