S
M
T
W
T
F
S
30
78°
55°
31
82°
39°
1
78°
48°
2
82°
12°
3
84°
-2°
4
91°
-4°
5
93°
46°
6
86°
46°
7
82°
64°
8
79°
39°
9
77°
54°
10
86°
27°
11
77°
34°
12
64°
45°
13
70°
50°
14
72°
54°
15
68°
45°
16
66°
45°
17
73°
43°
18
64°
59°
19
63°
57°
20
66°
52°
21
68°
46°
22
59°
45°
23
63°
55°
24
77°
50°
25
66°
46°
26
67°
46°
27
70°
55°
28
64°
52°
29
70°
49°
30
72°
44°
1
63°
46°
2
65°
47°
3
60°
38°
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 60° to 72°, with overnight lows between 38° and 55°. The average high for September is 66° with an average low of 47°. 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.
