S
M
T
W
T
F
S
30
79°
65°
31
78°
63°
1
80°
60°
2
75°
60°
3
74°
62°
4
76°
62°
5
72°
58°
6
72°
58°
7
77°
64°
8
77°
63°
9
75°
64°
10
76°
64°
11
74°
62°
12
74°
63°
13
78°
61°
14
73°
57°
15
73°
59°
16
75°
62°
17
73°
62°
18
77°
57°
19
77°
55°
20
68°
53°
21
71°
61°
22
76°
60°
23
75°
59°
24
75°
56°
25
68°
56°
26
67°
54°
27
66°
51°
28
65°
52°
29
66°
52°
30
67°
52°
1
65°
54°
2
70°
51°
3
62°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hammonasset State Park
Hammonasset State Park's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 51° and 65°. The average high for September is 73° with an average low of 58°. 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 Hammonasset State Park. See also: October | November | December.
