S
M
T
W
T
F
S
30
86°
70°
31
83°
70°
1
91°
73°
2
91°
73°
3
89°
73°
4
87°
73°
5
89°
73°
6
88°
73°
7
87°
71°
8
88°
72°
9
87°
71°
10
87°
72°
11
88°
71°
12
87°
72°
13
88°
71°
14
87°
72°
15
83°
72°
16
84°
71°
17
83°
72°
18
83°
72°
19
84°
71°
20
83°
72°
21
83°
72°
22
84°
71°
23
83°
72°
24
83°
72°
25
84°
71°
26
84°
71°
27
83°
72°
28
83°
72°
29
84°
71°
30
83°
72°
1
83°
72°
2
84°
71°
3
83°
72°
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 83° to 91°, with overnight lows between 71° and 73°. The average high for September is 85° with an average low of 72°. 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.
