S
M
T
W
T
F
S
30
74°
51°
31
72°
49°
1
74°
46°
2
72°
53°
3
65°
57°
4
66°
54°
5
65°
47°
6
69°
47°
7
70°
47°
8
67°
47°
9
66°
46°
10
66°
49°
11
69°
48°
12
65°
47°
13
67°
48°
14
66°
45°
15
64°
50°
16
68°
50°
17
67°
49°
18
61°
43°
19
61°
41°
20
65°
46°
21
69°
49°
22
69°
48°
23
68°
48°
24
67°
47°
25
67°
47°
26
68°
46°
27
66°
45°
28
67°
43°
29
58°
40°
30
55°
38°
1
55°
37°
2
56°
42°
3
58°
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 55° to 74°, with overnight lows between 37° and 57°. The average high for September is 65° with an average low of 46°. 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.
