S
M
T
W
T
F
S
30
89°
64°
31
69°
59°
1
84°
53°
2
88°
55°
3
87°
55°
4
89°
61°
5
88°
57°
6
91°
55°
7
85°
64°
8
92°
60°
9
93°
56°
10
90°
50°
11
90°
54°
12
89°
58°
13
91°
60°
14
84°
58°
15
82°
61°
16
75°
60°
17
76°
59°
18
80°
55°
19
80°
49°
20
80°
48°
21
79°
53°
22
80°
52°
23
77°
54°
24
81°
53°
25
79°
51°
26
80°
52°
27
76°
52°
28
72°
51°
29
71°
45°
30
72°
47°
1
75°
49°
2
78°
50°
3
70°
49°
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 70° to 84°, with overnight lows between 45° and 61°. The average high for September is 77° 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 Napi Headquarters. See also: October | November | December.
