S
M
T
W
T
F
S
30
83°
59°
31
87°
59°
1
89°
60°
2
89°
60°
3
88°
59°
4
82°
59°
5
80°
58°
6
80°
58°
7
81°
57°
8
80°
58°
9
81°
57°
10
80°
57°
11
87°
58°
12
87°
56°
13
88°
57°
14
86°
54°
15
86°
51°
16
84°
53°
17
84°
52°
18
82°
52°
19
81°
53°
20
85°
52°
21
84°
51°
22
84°
50°
23
82°
51°
24
82°
51°
25
81°
50°
26
80°
49°
27
80°
48°
28
79°
48°
29
79°
47°
30
80°
43°
1
76°
46°
2
74°
44°
3
71°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Napi Headquarters
Napi Headquarters's September 2026 forecast shows daily high temperatures ranging from 71° to 89°, with overnight lows between 43° and 60°. The average high for September is 82° with an average low of 53°. 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 Napi Headquarters. See also: October | November | December.
