S
M
T
W
T
F
S
30
74°
51°
31
72°
49°
1
72°
44°
2
72°
47°
3
61°
56°
4
71°
59°
5
67°
49°
6
66°
48°
7
74°
50°
8
62°
39°
9
62°
34°
10
75°
51°
11
61°
42°
12
73°
37°
13
67°
61°
14
63°
40°
15
66°
49°
16
71°
47°
17
65°
48°
18
65°
43°
19
63°
42°
20
60°
39°
21
59°
38°
22
62°
44°
23
64°
43°
24
66°
42°
25
68°
45°
26
66°
41°
27
57°
38°
28
64°
44°
29
60°
40°
30
56°
38°
1
64°
43°
2
64°
44°
3
62°
44°
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 56° to 71°, with overnight lows between 38° and 61°. The average high for September is 63° with an average low of 43°. 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.
