S
M
T
W
T
F
S
30
80°
48°
31
77°
44°
1
75°
41°
2
76°
45°
3
80°
47°
4
81°
47°
5
76°
46°
6
73°
38°
7
75°
45°
8
82°
46°
9
83°
47°
10
84°
47°
11
83°
46°
12
82°
47°
13
83°
46°
14
75°
40°
15
71°
42°
16
74°
43°
17
81°
44°
18
82°
45°
19
81°
43°
20
80°
42°
21
80°
43°
22
81°
43°
23
79°
42°
24
75°
42°
25
78°
41°
26
79°
41°
27
78°
40°
28
72°
38°
29
68°
40°
30
73°
37°
1
69°
30°
2
65°
29°
3
65°
32°
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 65° to 84°, with overnight lows between 29° and 48°. The average high for September is 77° with an average low of 42°. 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.
