S
M
T
W
T
F
S
30
79°
45°
31
79°
45°
1
77°
42°
2
68°
38°
3
68°
38°
4
74°
43°
5
76°
41°
6
66°
32°
7
66°
32°
8
68°
35°
9
72°
37°
10
77°
43°
11
77°
42°
12
76°
42°
13
75°
40°
14
72°
38°
15
70°
34°
16
70°
38°
17
73°
39°
18
77°
42°
19
76°
40°
20
75°
33°
21
72°
39°
22
73°
40°
23
76°
40°
24
75°
39°
25
72°
40°
26
73°
42°
27
74°
40°
28
74°
38°
29
63°
34°
30
61°
38°
1
64°
34°
2
58°
31°
3
55°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pierce-Headquarters
Pierce-Headquarters's September 2026 forecast shows daily high temperatures ranging from 55° to 79°, with overnight lows between 31° and 45°. The average high for September is 71° with an average low of 39°. 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 Pierce-Headquarters. See also: October | November | December.
