S
M
T
W
T
F
S
30
85°
50°
31
82°
45°
1
73°
53°
2
72°
57°
3
80°
48°
4
82°
44°
5
71°
45°
6
71°
53°
7
75°
53°
8
80°
44°
9
70°
43°
10
67°
47°
11
67°
44°
12
66°
41°
13
66°
45°
14
67°
48°
15
66°
52°
16
68°
51°
17
77°
43°
18
70°
43°
19
63°
48°
20
69°
41°
21
68°
45°
22
64°
40°
23
62°
41°
24
63°
39°
25
64°
46°
26
61°
36°
27
61°
36°
28
Hist. Avg.
66°
39°
29
Hist. Avg.
66°
39°
30
Hist. Avg.
66°
38°
1
Hist. Avg.
65°
38°
2
Hist. Avg.
65°
37°
3
Hist. Avg.
64°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Napoleon
Napoleon's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 36° and 57°. The average high for September is 70° with an average low of 46°. 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.
