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