S
M
T
W
T
F
S
30
86°
55°
31
78°
56°
1
78°
62°
2
79°
59°
3
83°
64°
4
85°
62°
5
86°
54°
6
80°
54°
7
77°
52°
8
76°
53°
9
78°
60°
10
79°
57°
11
77°
52°
12
74°
52°
13
75°
51°
14
76°
59°
15
75°
50°
16
77°
49°
17
73°
48°
18
72°
49°
19
72°
49°
20
73°
48°
21
71°
48°
22
72°
49°
23
74°
50°
24
76°
53°
25
78°
55°
26
78°
51°
27
77°
46°
28
70°
53°
29
70°
53°
30
77°
46°
1
72°
50°
2
73°
51°
3
68°
45°
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 68° to 86°, with overnight lows between 45° and 64°. The average high for September is 76° with an average low of 53°. 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.
