S
M
T
W
T
F
S
30
85°
69°
31
86°
70°
1
85°
69°
2
85°
69°
3
86°
70°
4
86°
71°
5
87°
70°
6
87°
70°
7
86°
69°
8
86°
70°
9
87°
69°
10
86°
70°
11
87°
69°
12
87°
70°
13
86°
70°
14
87°
69°
15
86°
70°
16
86°
71°
17
87°
71°
18
86°
70°
19
86°
67°
20
85°
71°
21
86°
71°
22
87°
70°
23
86°
70°
24
86°
69°
25
85°
71°
26
87°
70°
27
86°
71°
28
87°
72°
29
86°
71°
30
87°
72°
1
86°
71°
2
86°
70°
3
Hist. Avg.
82°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Waipahu
Waipahu's September 2026 forecast shows daily high temperatures ranging from 85° to 87°, with overnight lows between 67° and 72°. The average high for September is 86° with an average low of 70°. 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 Waipahu. See also: October | November | December.
