S
M
T
W
T
F
S
30
83°
61°
31
84°
63°
1
82°
63°
2
82°
61°
3
84°
54°
4
77°
54°
5
76°
58°
6
77°
61°
7
83°
58°
8
77°
57°
9
75°
59°
10
76°
60°
11
81°
59°
12
83°
60°
13
82°
60°
14
83°
59°
15
82°
57°
16
79°
57°
17
76°
50°
18
75°
50°
19
72°
47°
20
71°
46°
21
70°
48°
22
71°
53°
23
72°
48°
24
75°
49°
25
74°
54°
26
76°
54°
27
77°
55°
28
77°
52°
29
76°
51°
30
75°
49°
1
71°
50°
2
75°
51°
3
69°
44°
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 69° to 84°, with overnight lows between 44° and 63°. The average high for September is 77° with an average low of 55°. 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.
