S
M
T
W
T
F
S
30
90°
71°
31
92°
69°
1
87°
65°
2
85°
63°
3
82°
60°
4
82°
65°
5
94°
63°
6
90°
77°
7
99°
72°
8
98°
74°
9
100°
73°
10
96°
68°
11
93°
62°
12
88°
63°
13
87°
64°
14
88°
63°
15
86°
65°
16
87°
64°
17
88°
65°
18
86°
64°
19
85°
63°
20
83°
61°
21
80°
61°
22
80°
59°
23
81°
59°
24
79°
58°
25
80°
60°
26
79°
60°
27
78°
58°
28
81°
60°
29
82°
61°
30
85°
62°
1
85°
61°
2
84°
60°
3
85°
61°
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 78° to 100°, with overnight lows between 58° and 74°. The average high for September is 86° with an average low of 63°. 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.
