S
M
T
W
T
F
S
30
85°
56°
31
77°
56°
1
78°
62°
2
83°
56°
3
83°
62°
4
82°
63°
5
85°
57°
6
84°
54°
7
76°
53°
8
76°
53°
9
77°
59°
10
80°
59°
11
82°
52°
12
75°
53°
13
74°
52°
14
75°
59°
15
80°
52°
16
82°
50°
17
74°
49°
18
72°
49°
19
71°
50°
20
72°
49°
21
70°
49°
22
70°
50°
23
71°
48°
24
73°
53°
25
77°
55°
26
77°
55°
27
78°
47°
28
72°
54°
29
72°
54°
30
76°
50°
1
70°
51°
2
71°
47°
3
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Napoleon
Napoleon's September 2026 forecast shows daily high temperatures ranging from 67° to 85°, with overnight lows between 45° and 63°. 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 Napoleon. See also: October | November | December.
