S
M
T
W
T
F
S
30
78°
56°
31
78°
55°
1
77°
56°
2
78°
56°
3
78°
57°
4
79°
54°
5
79°
55°
6
78°
56°
7
76°
53°
8
77°
52°
9
74°
56°
10
75°
51°
11
75°
51°
12
74°
50°
13
75°
56°
14
75°
53°
15
79°
55°
16
80°
57°
17
80°
57°
18
79°
56°
19
79°
47°
20
73°
48°
21
70°
52°
22
70°
53°
23
74°
54°
24
75°
55°
25
76°
46°
26
75°
43°
27
72°
46°
28
65°
45°
29
66°
45°
30
66°
46°
1
66°
52°
2
Hist. Avg.
68°
44°
3
Hist. Avg.
68°
44°
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 65° to 80°, with overnight lows between 43° and 57°. The average high for September is 75° with an average low of 52°. 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.
