S
M
T
W
T
F
S
30
87°
65°
31
87°
65°
1
90°
67°
2
93°
66°
3
93°
67°
4
92°
69°
5
91°
68°
6
90°
69°
7
82°
64°
8
84°
61°
9
87°
60°
10
88°
59°
11
90°
60°
12
81°
67°
13
85°
61°
14
89°
61°
15
87°
64°
16
90°
64°
17
91°
64°
18
92°
64°
19
90°
64°
20
88°
66°
21
89°
65°
22
79°
64°
23
74°
60°
24
70°
58°
25
76°
44°
26
78°
41°
27
73°
45°
28
75°
47°
29
75°
51°
30
74°
52°
1
75°
52°
2
72°
49°
3
72°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Whittier
Whittier's September 2026 forecast shows daily high temperatures ranging from 70° to 79°, with overnight lows between 41° and 64°. The average high for September is 74° with an average low of 52°. 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 Whittier. See also: October | November | December.
