S
M
T
W
T
F
S
30
83°
67°
31
83°
67°
1
81°
66°
2
79°
66°
3
79°
65°
4
80°
65°
5
79°
61°
6
79°
61°
7
83°
64°
8
81°
62°
9
78°
60°
10
79°
64°
11
77°
58°
12
81°
58°
13
82°
63°
14
82°
56°
15
77°
56°
16
76°
55°
17
75°
56°
18
79°
57°
19
81°
56°
20
81°
56°
21
80°
60°
22
80°
62°
23
79°
60°
24
78°
58°
25
79°
58°
26
80°
60°
27
79°
59°
28
78°
59°
29
79°
58°
30
79°
60°
1
78°
59°
2
78°
59°
3
77°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alto
Alto's September 2026 forecast shows daily high temperatures ranging from 75° to 83°, with overnight lows between 54° and 67°. The average high for September is 79° with an average low of 60°. 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 Alto. See also: October | November | December.
