S
M
T
W
T
F
S
30
83°
76°
31
84°
75°
1
85°
77°
2
84°
75°
3
83°
76°
4
84°
73°
5
84°
76°
6
81°
75°
7
82°
78°
8
88°
76°
9
85°
72°
10
83°
78°
11
83°
77°
12
83°
73°
13
83°
73°
14
83°
76°
15
84°
76°
16
85°
76°
17
84°
78°
18
85°
78°
19
84°
76°
20
85°
78°
21
84°
77°
22
84°
78°
23
87°
78°
24
86°
77°
25
87°
77°
26
85°
77°
27
84°
77°
28
86°
76°
29
85°
76°
30
86°
73°
1
85°
74°
2
85°
73°
3
86°
75°
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 84° to 87°, with overnight lows between 73° and 78°. The average high for September is 86° with an average low of 76°. 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.
