S
M
T
W
T
F
S
30
65°
45°
31
65°
46°
1
67°
50°
2
70°
54°
3
66°
55°
4
74°
55°
5
76°
51°
6
72°
46°
7
65°
43°
8
65°
44°
9
69°
42°
10
68°
47°
11
69°
44°
12
63°
45°
13
69°
51°
14
72°
50°
15
72°
49°
16
63°
48°
17
62°
49°
18
64°
48°
19
66°
43°
20
61°
46°
21
67°
39°
22
62°
37°
23
60°
37°
24
59°
38°
25
61°
40°
26
59°
37°
27
58°
39°
28
58°
40°
29
56°
35°
30
56°
37°
1
57°
38°
2
63°
34°
3
55°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Blue Mountain Lake
Blue Mountain Lake's September 2026 forecast shows daily high temperatures ranging from 55° to 76°, with overnight lows between 34° and 55°. The average high for September is 64° 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 Blue Mountain Lake. See also: October | November | December.
