S
M
T
W
T
F
S
30
86°
78°
31
85°
75°
1
86°
77°
2
83°
76°
3
85°
76°
4
85°
76°
5
86°
75°
6
82°
75°
7
80°
75°
8
87°
77°
9
85°
75°
10
86°
74°
11
84°
77°
12
84°
72°
13
83°
72°
14
83°
71°
15
84°
71°
16
83°
78°
17
84°
76°
18
85°
75°
19
84°
76°
20
84°
78°
21
84°
77°
22
84°
75°
23
84°
78°
24
84°
77°
25
85°
76°
26
84°
75°
27
85°
77°
28
85°
77°
29
85°
77°
30
84°
74°
1
82°
76°
2
83°
74°
3
84°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kapa'a
Kapa'a's September 2026 forecast shows daily high temperatures ranging from 82° to 84°, with overnight lows between 73° and 76°. The average high for September is 83° with an average low of 74°. 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 Kapa'a. See also: October | November | December.
