S
M
T
W
T
F
S
30
83°
70°
31
84°
69°
1
83°
70°
2
83°
70°
3
84°
69°
4
85°
70°
5
85°
70°
6
84°
69°
7
83°
70°
8
84°
70°
9
83°
69°
10
84°
70°
11
83°
69°
12
84°
70°
13
84°
70°
14
83°
69°
15
84°
70°
16
84°
70°
17
83°
69°
18
84°
70°
19
84°
66°
20
83°
70°
21
84°
70°
22
84°
69°
23
83°
69°
24
84°
70°
25
84°
70°
26
82°
68°
27
83°
69°
28
84°
70°
29
83°
69°
30
84°
70°
1
83°
68°
2
83°
69°
3
83°
70°
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 82° to 85°, with overnight lows between 66° and 70°. The average high for September is 84° with an average low of 69°. 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.
