S
M
T
W
T
F
S
30
74°
51°
31
72°
49°
1
72°
44°
2
73°
54°
3
62°
58°
4
66°
54°
5
65°
47°
6
69°
43°
7
70°
47°
8
67°
45°
9
66°
50°
10
67°
49°
11
65°
45°
12
65°
47°
13
64°
47°
14
63°
44°
15
64°
45°
16
68°
50°
17
67°
49°
18
69°
48°
19
70°
48°
20
69°
47°
21
70°
48°
22
70°
48°
23
68°
47°
24
62°
45°
25
65°
47°
26
68°
47°
27
66°
46°
28
60°
45°
29
61°
44°
30
62°
44°
1
57°
39°
2
55°
35°
3
56°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Maine
Maine's September 2026 forecast shows daily high temperatures ranging from 55° to 73°, with overnight lows between 35° and 58°. The average high for September is 65° with an average low of 47°. 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 Maine. See also: October | November | December.
