S
M
T
W
T
F
S
30
92°
67°
31
93°
66°
1
96°
67°
2
97°
68°
3
99°
70°
4
99°
70°
5
95°
70°
6
93°
70°
7
84°
68°
8
87°
67°
9
86°
69°
10
83°
68°
11
79°
65°
12
82°
61°
13
84°
62°
14
85°
61°
15
84°
60°
16
83°
60°
17
82°
63°
18
81°
59°
19
77°
59°
20
78°
54°
21
82°
58°
22
79°
57°
23
80°
59°
24
80°
58°
25
79°
58°
26
80°
57°
27
80°
58°
28
79°
58°
29
79°
57°
30
78°
57°
1
79°
55°
2
75°
49°
3
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Altamont
Altamont's September 2026 forecast shows daily high temperatures ranging from 67° to 87°, with overnight lows between 45° and 69°. The average high for September is 80° with an average low of 59°. 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 Altamont. See also: October | November | December.
