S
M
T
W
T
F
S
30
59°
51°
31
62°
52°
1
57°
48°
2
56°
47°
3
55°
46°
4
56°
46°
5
55°
44°
6
54°
48°
7
55°
47°
8
55°
46°
9
56°
45°
10
54°
45°
11
53°
44°
12
55°
45°
13
54°
44°
14
53°
43°
15
51°
44°
16
51°
45°
17
52°
48°
18
52°
47°
19
53°
45°
20
51°
46°
21
49°
47°
22
Hist. Avg.
51°
38°
23
Hist. Avg.
51°
38°
24
Hist. Avg.
51°
38°
25
Hist. Avg.
50°
38°
26
Hist. Avg.
50°
38°
27
Hist. Avg.
50°
37°
28
Hist. Avg.
49°
37°
29
Hist. Avg.
49°
37°
30
Hist. Avg.
49°
37°
1
Hist. Avg.
48°
36°
2
Hist. Avg.
48°
36°
3
Hist. Avg.
48°
36°
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 49° to 62°, with overnight lows between 43° and 52°. The average high for September is 54° with an average low of 46°. 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.
