S
M
T
W
T
F
S
29
42°
28°
30
46°
23°
1
45°
22°
2
34°
29°
3
40°
29°
4
41°
28°
5
42°
30°
6
44°
29°
7
44°
29°
8
45°
30°
9
44°
30°
10
44°
27°
11
43°
18°
12
42°
15°
13
31°
14°
14
27°
13°
15
28°
15°
16
32°
13°
17
28°
10°
18
26°
11°
19
24°
14°
20
27°
18°
21
31°
21°
22
33°
23°
23
37°
21°
24
39°
12°
25
39°
6°
26
26°
5°
27
26°
16°
28
27°
11°
29
36°
6°
30
31°
3°
31
21°
8°
1
24°
13°
2
30°
4°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Deer Isle
Deer Isle's December 2026 forecast shows daily high temperatures ranging from 21° to 46°, with overnight lows between 3° and 30°. The average high for December is 35° with an average low of 18°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Deer Isle. See also: January | February | March.
