S
M
T
W
T
F
S
30
73°
64°
31
77°
64°
1
78°
63°
2
79°
64°
3
79°
57°
4
77°
56°
5
71°
58°
6
71°
62°
7
73°
62°
8
76°
61°
9
75°
62°
10
76°
61°
11
75°
59°
12
75°
56°
13
74°
61°
14
75°
62°
15
75°
61°
16
76°
56°
17
75°
60°
18
72°
59°
19
74°
56°
20
70°
52°
21
67°
51°
22
67°
55°
23
66°
54°
24
72°
51°
25
66°
50°
26
66°
50°
27
65°
55°
28
70°
56°
29
69°
52°
30
69°
52°
1
62°
53°
2
63°
48°
3
63°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in West Harwich
West Harwich's September 2026 forecast shows daily high temperatures ranging from 62° to 79°, with overnight lows between 48° and 64°. The average high for September is 72° with an average low of 57°. 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 West Harwich. See also: October | November | December.
