S
M
T
W
T
F
S
30
70°
49°
31
69°
48°
1
68°
47°
2
68°
41°
3
67°
40°
4
68°
41°
5
67°
40°
6
59°
38°
7
58°
42°
8
57°
46°
9
57°
46°
10
58°
43°
11
57°
37°
12
56°
40°
13
56°
42°
14
57°
40°
15
56°
38°
16
55°
37°
17
56°
38°
18
60°
45°
19
63°
40°
20
62°
39°
21
58°
34°
22
53°
34°
23
53°
37°
24
54°
36°
25
51°
34°
26
52°
36°
27
52°
38°
28
53°
36°
29
51°
37°
30
51°
35°
1
52°
39°
2
55°
42°
3
58°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grouse Mountain
Grouse Mountain's September 2026 forecast shows daily high temperatures ranging from 51° to 70°, with overnight lows between 34° and 49°. The average high for September is 58° with an average low of 40°. 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 Grouse Mountain. See also: October | November | December.
