S
M
T
W
T
F
S
30
74°
65°
31
73°
66°
1
74°
67°
2
74°
67°
3
75°
64°
4
73°
65°
5
74°
61°
6
72°
59°
7
72°
61°
8
75°
62°
9
71°
59°
10
70°
57°
11
71°
60°
12
72°
62°
13
76°
65°
14
79°
65°
15
80°
64°
16
78°
64°
17
79°
65°
18
78°
65°
19
77°
64°
20
77°
64°
21
76°
63°
22
77°
63°
23
76°
62°
24
76°
63°
25
77°
62°
26
77°
61°
27
75°
57°
28
66°
55°
29
66°
59°
30
75°
59°
1
71°
57°
2
68°
45°
3
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in East Harbor State Park
East Harbor State Park's September 2026 forecast shows daily high temperatures ranging from 63° to 80°, with overnight lows between 44° and 67°. The average high for September is 74° with an average low of 61°. 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 East Harbor State Park. See also: October | November | December.