S
M
T
W
T
F
S
30
77°
57°
31
78°
62°
1
77°
63°
2
80°
62°
3
78°
54°
4
77°
53°
5
75°
54°
6
76°
54°
7
78°
57°
8
81°
58°
9
82°
60°
10
82°
53°
11
76°
55°
12
75°
58°
13
75°
51°
14
74°
52°
15
71°
51°
16
72°
50°
17
73°
55°
18
75°
48°
19
74°
49°
20
73°
49°
21
76°
51°
22
73°
55°
23
77°
56°
24
78°
56°
25
76°
55°
26
78°
55°
27
77°
54°
28
79°
54°
29
77°
52°
30
76°
54°
1
77°
54°
2
78°
46°
3
76°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in America
America's September 2026 forecast shows daily high temperatures ranging from 71° to 82°, with overnight lows between 42° and 63°. The average high for September is 76° with an average low of 54°. 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 America. See also: October | November | December.
