S
M
T
W
T
F
S
30
80°
58°
31
76°
57°
1
72°
57°
2
74°
63°
3
74°
57°
4
77°
63°
5
74°
63°
6
78°
58°
7
77°
57°
8
70°
56°
9
72°
56°
10
71°
61°
11
72°
55°
12
75°
55°
13
70°
54°
14
69°
60°
15
71°
61°
16
74°
52°
17
76°
52°
18
67°
53°
19
66°
53°
20
66°
54°
21
67°
54°
22
65°
55°
23
65°
55°
24
66°
54°
25
68°
56°
26
71°
58°
27
70°
54°
28
72°
49°
29
64°
49°
30
62°
55°
1
63°
57°
2
68°
56°
3
69°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harwich Center
Harwich Center's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 49° and 63°. The average high for September is 71° with an average low of 56°. 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 Harwich Center. See also: October | November | December.
