S
M
T
W
T
F
S
30
67°
41°
31
71°
45°
1
75°
49°
2
77°
50°
3
76°
48°
4
66°
39°
5
68°
39°
6
67°
41°
7
70°
42°
8
71°
49°
9
68°
41°
10
68°
39°
11
69°
42°
12
68°
48°
13
66°
40°
14
64°
38°
15
64°
39°
16
65°
39°
17
66°
41°
18
67°
40°
19
73°
43°
20
73°
39°
21
66°
41°
22
65°
40°
23
61°
39°
24
63°
38°
25
60°
35°
26
62°
36°
27
61°
37°
28
64°
43°
29
68°
41°
30
59°
36°
1
60°
38°
2
Hist. Avg.
64°
44°
3
Hist. Avg.
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in National
National's September 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 35° and 50°. The average high for September is 67° with an average low of 41°. 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 National. See also: October | November | December.
