S
M
T
W
T
F
S
30
84°
73°
31
83°
74°
1
83°
73°
2
84°
73°
3
83°
74°
4
84°
75°
5
85°
74°
6
85°
74°
7
84°
73°
8
84°
74°
9
85°
73°
10
84°
74°
11
85°
73°
12
85°
74°
13
84°
74°
14
85°
73°
15
84°
74°
16
84°
75°
17
85°
75°
18
85°
74°
19
86°
72°
20
84°
75°
21
85°
75°
22
86°
74°
23
85°
74°
24
85°
73°
25
84°
75°
26
86°
74°
27
85°
75°
28
86°
76°
29
85°
75°
30
86°
76°
1
85°
75°
2
85°
74°
3
84°
73°
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.
