S
M
T
W
T
F
S
30
88°
71°
31
89°
73°
1
90°
75°
2
N/A
3
90°
73°
4
90°
73°
5
90°
75°
6
86°
76°
7
87°
77°
8
89°
77°
9
90°
74°
10
89°
71°
11
90°
72°
12
88°
72°
13
90°
72°
14
90°
73°
15
89°
74°
16
86°
76°
17
85°
74°
18
86°
74°
19
86°
74°
20
85°
75°
21
86°
74°
22
85°
74°
23
85°
74°
24
86°
75°
25
85°
74°
26
85°
74°
27
86°
73°
28
85°
75°
29
85°
75°
30
86°
73°
1
85°
74°
2
85°
73°
3
86°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Ko Olina
Ko Olina's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 71° and 77°. The average high for September is 87° 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 Ko Olina. See also: October | November | December.
