S
M
T
W
T
F
S
30
72°
63°
31
73°
64°
1
78°
64°
2
78°
63°
3
77°
59°
4
77°
63°
5
76°
58°
6
76°
58°
7
71°
61°
8
69°
62°
9
70°
57°
10
76°
55°
11
70°
61°
12
72°
57°
13
76°
57°
14
70°
56°
15
68°
60°
16
70°
54°
17
69°
54°
18
Hist. Avg.
70°
58°
19
Hist. Avg.
70°
58°
20
Hist. Avg.
69°
58°
21
Hist. Avg.
69°
57°
22
Hist. Avg.
69°
57°
23
Hist. Avg.
68°
57°
24
Hist. Avg.
68°
56°
25
Hist. Avg.
68°
56°
26
Hist. Avg.
67°
56°
27
Hist. Avg.
67°
55°
28
Hist. Avg.
67°
55°
29
Hist. Avg.
66°
55°
30
Hist. Avg.
66°
54°
1
Hist. Avg.
66°
54°
2
Hist. Avg.
66°
54°
3
Hist. Avg.
65°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South Harwich
South Harwich's September 2026 forecast shows daily high temperatures ranging from 68° to 78°, with overnight lows between 54° and 64°. The average high for September is 73° with an average low of 59°. 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 South Harwich. See also: October | November | December.
