S
M
T
W
T
F
S
30
87°
57°
31
80°
56°
1
79°
62°
2
79°
61°
3
82°
57°
4
83°
63°
5
85°
62°
6
86°
55°
7
82°
55°
8
77°
54°
9
77°
55°
10
81°
57°
11
83°
55°
12
79°
55°
13
74°
53°
14
75°
60°
15
79°
59°
16
82°
52°
17
81°
51°
18
73°
50°
19
72°
51°
20
73°
56°
21
71°
56°
22
72°
51°
23
71°
52°
24
71°
51°
25
73°
56°
26
75°
57°
27
78°
50°
28
77°
48°
29
70°
54°
30
70°
55°
1
69°
56°
2
71°
53°
3
73°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Blue Mountain
Blue Mountain's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 47° and 63°. The average high for September is 77° with an average low of 55°. 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. See also: October | November | December.
