S
M
T
W
T
F
S
30
60°
43°
31
69°
42°
1
75°
55°
2
67°
49°
3
55°
46°
4
51°
46°
5
62°
53°
6
65°
30°
7
69°
32°
8
72°
41°
9
76°
43°
10
60°
36°
11
62°
43°
12
68°
45°
13
68°
51°
14
65°
43°
15
65°
44°
16
68°
46°
17
65°
45°
18
66°
43°
19
63°
44°
20
62°
42°
21
64°
41°
22
63°
42°
23
63°
42°
24
62°
44°
25
58°
40°
26
57°
38°
27
56°
37°
28
57°
38°
29
60°
42°
30
58°
43°
1
63°
45°
2
63°
46°
3
60°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Napan
Napan's September 2026 forecast shows daily high temperatures ranging from 56° to 68°, with overnight lows between 37° and 51°. The average high for September is 62° with an average low of 43°. 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 Napan. See also: October | November | December.
