S
M
T
W
T
F
S
30
85°
63°
31
86°
64°
1
89°
63°
2
89°
63°
3
90°
67°
4
90°
67°
5
88°
66°
6
89°
67°
7
87°
66°
8
87°
66°
9
86°
65°
10
87°
65°
11
86°
64°
12
87°
65°
13
87°
64°
14
86°
65°
15
86°
65°
16
85°
63°
17
86°
60°
18
80°
61°
19
84°
58°
20
83°
56°
21
78°
55°
22
76°
58°
23
78°
60°
24
83°
58°
25
83°
59°
26
82°
59°
27
83°
58°
28
82°
57°
29
81°
56°
30
81°
55°
1
79°
56°
2
81°
56°
3
75°
50°
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 75° to 90°, with overnight lows between 50° and 67°. The average high for September is 84° with an average low of 61°. 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.
