S
M
T
W
T
F
S
30
90°
69°
31
91°
68°
1
91°
69°
2
90°
69°
3
91°
71°
4
88°
69°
5
91°
66°
6
90°
60°
7
83°
60°
8
82°
62°
9
83°
63°
10
86°
66°
11
89°
64°
12
89°
65°
13
87°
68°
14
89°
67°
15
89°
63°
16
86°
65°
17
87°
65°
18
86°
66°
19
87°
64°
20
86°
61°
21
84°
65°
22
81°
65°
23
79°
61°
24
81°
65°
25
81°
62°
26
83°
60°
27
80°
60°
28
80°
63°
29
81°
58°
30
79°
62°
1
79°
66°
2
86°
64°
3
80°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Whittier
South Whittier's September 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 58° and 71°. The average high for September is 85° with an average low of 64°. 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 South Whittier. See also: October | November | December.
