S
M
T
W
T
F
S
30
72°
52°
31
75°
55°
1
77°
55°
2
78°
54°
3
77°
52°
4
77°
53°
5
76°
47°
6
76°
45°
7
69°
46°
8
69°
51°
9
70°
51°
10
74°
46°
11
73°
45°
12
69°
49°
13
73°
44°
14
69°
50°
15
72°
49°
16
72°
43°
17
Hist. Avg.
67°
46°
18
Hist. Avg.
67°
46°
19
Hist. Avg.
66°
46°
20
Hist. Avg.
66°
45°
21
Hist. Avg.
66°
45°
22
Hist. Avg.
65°
45°
23
Hist. Avg.
65°
45°
24
Hist. Avg.
65°
44°
25
Hist. Avg.
64°
44°
26
Hist. Avg.
64°
44°
27
Hist. Avg.
64°
44°
28
Hist. Avg.
63°
43°
29
Hist. Avg.
63°
43°
30
Hist. Avg.
63°
43°
1
Hist. Avg.
62°
43°
2
Hist. Avg.
62°
42°
3
Hist. Avg.
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Blue Mountain
Blue Mountain's September 2026 forecast shows daily high temperatures ranging from 69° to 78°, with overnight lows between 43° and 55°. The average high for September is 73° 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 Blue Mountain. See also: October | November | December.
