S
M
T
W
T
F
S
30
82°
64°
31
89°
69°
1
92°
71°
2
92°
70°
3
92°
71°
4
90°
71°
5
88°
68°
6
76°
59°
7
79°
59°
8
85°
59°
9
86°
67°
10
78°
62°
11
79°
56°
12
80°
65°
13
80°
56°
14
71°
47°
15
90°
57°
16
84°
69°
17
87°
71°
18
77°
65°
19
81°
62°
20
77°
58°
21
62°
52°
22
64°
55°
23
65°
52°
24
69°
50°
25
70°
51°
26
70°
48°
27
75°
49°
28
73°
51°
29
74°
54°
30
71°
53°
1
73°
50°
2
72°
48°
3
66°
54°
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 62° to 77°, with overnight lows between 48° and 58°. The average high for September is 70° with an average low of 52°. 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.
