S
M
T
W
T
F
S
30
80°
56°
31
79°
51°
1
79°
50°
2
72°
53°
3
72°
51°
4
73°
50°
5
72°
50°
6
71°
51°
7
73°
50°
8
76°
49°
9
73°
54°
10
73°
56°
11
71°
55°
12
75°
55°
13
76°
53°
14
75°
50°
15
68°
51°
16
72°
51°
17
67°
50°
18
69°
53°
19
73°
53°
20
Hist. Avg.
68°
48°
21
Hist. Avg.
67°
48°
22
Hist. Avg.
67°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
45°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
44°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
43°
3
Hist. Avg.
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Acadia National Park
Acadia National Park's September 2026 forecast shows daily high temperatures ranging from 67° to 80°, with overnight lows between 49° and 56°. The average high for September is 73° with an average low of 52°. 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 Acadia National Park. See also: October | November | December.
