S
M
T
W
T
F
S
30
79°
50°
31
80°
55°
1
82°
53°
2
81°
52°
3
84°
58°
4
81°
57°
5
76°
54°
6
77°
53°
7
80°
53°
8
81°
56°
9
78°
57°
10
76°
55°
11
84°
58°
12
85°
59°
13
88°
54°
14
87°
53°
15
85°
53°
16
84°
52°
17
79°
53°
18
82°
52°
19
84°
52°
20
80°
51°
21
83°
53°
22
83°
54°
23
81°
50°
24
80°
49°
25
79°
47°
26
75°
45°
27
72°
43°
28
68°
44°
29
76°
46°
30
79°
49°
1
72°
40°
2
66°
38°
3
71°
40°
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 66° to 88°, with overnight lows between 38° and 59°. The average high for September is 79° with an average low of 51°. 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.
