S
M
T
W
T
F
S
30
87°
77°
31
88°
76°
1
86°
73°
2
86°
74°
3
85°
75°
4
86°
74°
5
85°
74°
6
85°
70°
7
85°
70°
8
86°
71°
9
84°
68°
10
85°
70°
11
86°
69°
12
84°
70°
13
85°
71°
14
83°
68°
15
80°
70°
16
81°
70°
17
80°
71°
18
80°
71°
19
81°
70°
20
80°
71°
21
80°
70°
22
81°
70°
23
80°
69°
24
80°
71°
25
79°
71°
26
80°
70°
27
80°
71°
28
80°
71°
29
80°
70°
30
80°
71°
1
81°
71°
2
80°
70°
3
79°
71°
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 79° to 86°, with overnight lows between 68° and 75°. The average high for September is 82° with an average low of 71°. 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.
