S
M
T
W
T
F
S
30
75°
52°
31
75°
52°
1
76°
53°
2
75°
52°
3
76°
52°
4
77°
51°
5
77°
51°
6
76°
52°
7
74°
50°
8
75°
49°
9
73°
52°
10
73°
48°
11
74°
48°
12
73°
47°
13
74°
54°
14
74°
48°
15
78°
51°
16
78°
54°
17
77°
55°
18
79°
53°
19
79°
45°
20
72°
45°
21
69°
51°
22
69°
51°
23
72°
52°
24
75°
53°
25
74°
43°
26
73°
41°
27
69°
43°
28
64°
42°
29
65°
42°
30
64°
40°
1
Hist. Avg.
68°
46°
2
Hist. Avg.
67°
46°
3
Hist. Avg.
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 64° to 79°, with overnight lows between 40° and 55°. The average high for September is 74° with an average low of 49°. 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.
