S
M
T
W
T
F
S
30
69°
47°
31
68°
49°
1
67°
48°
2
70°
51°
3
71°
53°
4
70°
53°
5
67°
52°
6
66°
47°
7
70°
47°
8
69°
48°
9
66°
47°
10
70°
51°
11
70°
51°
12
69°
50°
13
68°
53°
14
69°
52°
15
62°
44°
16
61°
49°
17
65°
50°
18
62°
51°
19
62°
49°
20
60°
42°
21
60°
45°
22
Hist. Avg.
64°
42°
23
Hist. Avg.
63°
42°
24
Hist. Avg.
63°
42°
25
Hist. Avg.
63°
41°
26
Hist. Avg.
63°
41°
27
Hist. Avg.
62°
41°
28
Hist. Avg.
62°
41°
29
Hist. Avg.
62°
41°
30
Hist. Avg.
62°
40°
1
Hist. Avg.
61°
40°
2
Hist. Avg.
61°
40°
3
Hist. Avg.
61°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lachen
Lachen's September 2026 forecast shows daily high temperatures ranging from 60° to 71°, with overnight lows between 42° and 53°. The average high for September is 67° with an average low of 49°. 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 Lachen. See also: October | November | December.
