S
M
T
W
T
F
S
30
89°
74°
31
90°
75°
1
90°
75°
2
89°
74°
3
90°
73°
4
91°
73°
5
89°
70°
6
88°
73°
7
88°
72°
8
89°
73°
9
88°
74°
10
88°
73°
11
89°
73°
12
89°
72°
13
88°
73°
14
89°
74°
15
90°
74°
16
90°
74°
17
89°
74°
18
89°
73°
19
90°
72°
20
88°
71°
21
89°
74°
22
90°
73°
23
Hist. Avg.
89°
71°
24
Hist. Avg.
89°
71°
25
Hist. Avg.
89°
71°
26
Hist. Avg.
89°
71°
27
Hist. Avg.
89°
71°
28
Hist. Avg.
89°
71°
29
Hist. Avg.
88°
71°
30
Hist. Avg.
88°
71°
1
Hist. Avg.
88°
71°
2
Hist. Avg.
88°
71°
3
Hist. Avg.
88°
71°
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 88° to 91°, with overnight lows between 70° and 75°. The average high for September is 89° with an average low of 73°. 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.
