S
M
T
W
T
F
S
30
70°
49°
31
77°
34°
1
73°
52°
2
70°
45°
3
70°
36°
4
77°
34°
5
79°
41°
6
77°
36°
7
64°
37°
8
72°
32°
9
72°
28°
10
77°
32°
11
75°
43°
12
81°
46°
13
76°
42°
14
67°
36°
15
74°
40°
16
74°
42°
17
73°
42°
18
75°
41°
19
77°
43°
20
74°
40°
21
75°
42°
22
73°
43°
23
74°
44°
24
75°
45°
25
69°
36°
26
61°
36°
27
69°
42°
28
61°
34°
29
58°
29°
30
60°
38°
1
61°
34°
2
69°
37°
3
62°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alpine
Alpine's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 29° and 46°. The average high for September is 70° with an average low of 39°. 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 Alpine. See also: October | November | December.
