S
M
T
W
T
F
S
30
88°
63°
31
89°
67°
1
88°
66°
2
87°
61°
3
86°
59°
4
84°
59°
5
85°
61°
6
86°
64°
7
88°
67°
8
92°
67°
9
92°
66°
10
88°
63°
11
89°
65°
12
88°
66°
13
90°
58°
14
86°
57°
15
84°
57°
16
85°
58°
17
84°
57°
18
85°
58°
19
87°
57°
20
88°
60°
21
89°
62°
22
88°
62°
23
82°
61°
24
82°
61°
25
81°
60°
26
87°
60°
27
87°
59°
28
86°
60°
29
86°
59°
30
85°
59°
1
87°
58°
2
87°
53°
3
86°
52°
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 81° to 92°, with overnight lows between 52° and 67°. The average high for September is 87° with an average low of 61°. 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.
