S
M
T
W
T
F
S
30
84°
74°
31
83°
75°
1
83°
74°
2
84°
74°
3
83°
75°
4
84°
76°
5
85°
76°
6
85°
75°
7
84°
75°
8
84°
76°
9
85°
74°
10
84°
75°
11
85°
74°
12
85°
75°
13
84°
75°
14
85°
74°
15
84°
75°
16
84°
76°
17
85°
76°
18
84°
75°
19
86°
73°
20
84°
75°
21
84°
76°
22
85°
76°
23
84°
75°
24
84°
75°
25
83°
76°
26
83°
75°
27
85°
76°
28
84°
77°
29
85°
76°
30
84°
77°
1
85°
76°
2
85°
75°
3
84°
74°
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 83° to 86°, with overnight lows between 73° and 77°. The average high for September is 84° with an average low of 75°. 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.
