S
M
T
W
T
F
S
30
88°
70°
31
86°
69°
1
86°
70°
2
87°
69°
3
86°
70°
4
87°
69°
5
87°
70°
6
86°
71°
7
87°
71°
8
88°
70°
9
88°
72°
10
87°
72°
11
88°
71°
12
89°
67°
13
88°
72°
14
88°
71°
15
87°
71°
16
88°
70°
17
88°
71°
18
87°
71°
19
88°
69°
20
86°
70°
21
87°
71°
22
86°
70°
23
87°
70°
24
86°
71°
25
87°
69°
26
87°
69°
27
Hist. Avg.
82°
67°
28
Hist. Avg.
82°
67°
29
Hist. Avg.
82°
67°
30
Hist. Avg.
82°
67°
1
Hist. Avg.
82°
67°
2
Hist. Avg.
82°
67°
3
Hist. Avg.
82°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Waipahu
Waipahu's September 2026 forecast shows daily high temperatures ranging from 86° to 89°, with overnight lows between 67° and 72°. The average high for September is 87° 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.
