S
M
T
W
T
F
S
30
86°
78°
31
85°
75°
1
86°
77°
2
84°
78°
3
85°
76°
4
83°
77°
5
85°
75°
6
86°
77°
7
84°
78°
8
85°
77°
9
84°
76°
10
85°
76°
11
85°
76°
12
84°
75°
13
84°
77°
14
85°
76°
15
82°
76°
16
81°
75°
17
81°
75°
18
82°
76°
19
82°
77°
20
83°
77°
21
82°
76°
22
82°
75°
23
83°
75°
24
82°
76°
25
82°
77°
26
83°
77°
27
82°
76°
28
82°
76°
29
83°
77°
30
82°
77°
1
82°
76°
2
83°
77°
3
82°
76°
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 81° to 86°, with overnight lows between 75° and 78°. The average high for September is 83° with an average low of 76°. 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.
