S
M
T
W
T
F
S
30
89°
70°
31
85°
65°
1
85°
63°
2
82°
63°
3
80°
64°
4
82°
63°
5
89°
63°
6
76°
66°
7
93°
73°
8
92°
76°
9
107°
81°
10
94°
75°
11
88°
71°
12
85°
70°
13
85°
69°
14
83°
67°
15
79°
66°
16
79°
66°
17
79°
64°
18
79°
63°
19
82°
64°
20
81°
64°
21
79°
65°
22
N/A
23
87°
64°
24
83°
66°
25
86°
65°
26
N/A
27
88°
66°
28
85°
63°
29
88°
67°
30
87°
67°
1
90°
69°
2
93°
67°
3
97°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Whittier
Whittier's September 2026 forecast shows daily high temperatures ranging from 85° to 97°, with overnight lows between 63° and 69°. The average high for September is 90° with an average low of 67°. 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.
