S
M
T
W
T
F
S
30
76°
54°
31
80°
58°
1
78°
50°
2
78°
49°
3
72°
49°
4
69°
48°
5
70°
48°
6
70°
53°
7
77°
58°
8
80°
57°
9
79°
49°
10
71°
49°
11
72°
51°
12
70°
48°
13
72°
47°
14
69°
44°
15
67°
46°
16
70°
51°
17
73°
47°
18
74°
45°
19
67°
48°
20
70°
42°
21
66°
49°
22
65°
52°
23
74°
53°
24
75°
51°
25
74°
51°
26
67°
52°
27
74°
50°
28
72°
48°
29
70°
50°
30
69°
50°
1
73°
41°
2
72°
38°
3
62°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Altoona
Altoona's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 38° and 58°. The average high for September is 72° with an average low of 49°. 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 Altoona. See also: October | November | December.
