S
M
T
W
T
F
S
30
79°
43°
31
75°
41°
1
70°
39°
2
68°
42°
3
69°
40°
4
67°
41°
5
67°
40°
6
68°
40°
7
71°
41°
8
74°
40°
9
74°
41°
10
73°
46°
11
69°
46°
12
68°
45°
13
73°
39°
14
71°
38°
15
70°
40°
16
64°
42°
17
62°
39°
18
66°
43°
19
60°
36°
20
61°
42°
21
Hist. Avg.
63°
45°
22
Hist. Avg.
63°
44°
23
Hist. Avg.
62°
44°
24
Hist. Avg.
62°
44°
25
Hist. Avg.
61°
43°
26
Hist. Avg.
61°
43°
27
Hist. Avg.
60°
42°
28
Hist. Avg.
60°
42°
29
Hist. Avg.
59°
42°
30
Hist. Avg.
59°
41°
1
Hist. Avg.
58°
41°
2
Hist. Avg.
58°
41°
3
Hist. Avg.
57°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Allagash
Allagash's September 2026 forecast shows daily high temperatures ranging from 60° to 79°, with overnight lows between 36° and 46°. The average high for September is 69° with an average low of 41°. 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 Allagash. See also: October | November | December.
