S
M
T
W
T
F
S
30
84°
74°
31
85°
73°
1
84°
73°
2
84°
74°
3
85°
74°
4
85°
75°
5
86°
76°
6
86°
75°
7
85°
75°
8
85°
74°
9
86°
74°
10
85°
73°
11
85°
74°
12
84°
73°
13
85°
74°
14
84°
73°
15
83°
74°
16
83°
74°
17
84°
73°
18
84°
75°
19
85°
76°
20
86°
76°
21
85°
75°
22
86°
74°
23
85°
72°
24
85°
74°
25
86°
74°
26
85°
73°
27
84°
75°
28
85°
75°
29
85°
74°
30
84°
73°
1
85°
74°
2
84°
73°
3
83°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kailua
Kailua's September 2026 forecast shows daily high temperatures ranging from 83° to 86°, with overnight lows between 72° and 76°. The average high for September is 85° 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 Kailua. See also: October | November | December.
