S
M
T
W
T
F
S
29
45°
33°
30
42°
30°
1
40°
30°
2
37°
32°
3
42°
32°
4
43°
31°
5
44°
29°
6
39°
30°
7
38°
31°
8
40°
32°
9
41°
30°
10
39°
29°
11
44°
24°
12
44°
26°
13
36°
26°
14
42°
27°
15
42°
20°
16
38°
15°
17
31°
22°
18
35°
21°
19
41°
16°
20
33°
20°
21
31°
26°
22
40°
25°
23
42°
25°
24
40°
28°
25
42°
19°
26
43°
18°
27
43°
16°
28
29°
18°
29
29°
22°
30
34°
24°
31
39°
24°
1
39°
25°
2
40°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Bar Harbor
Bar Harbor's December 2026 forecast shows daily high temperatures ranging from 29° to 45°, with overnight lows between 15° and 33°. The average high for December is 39° with an average low of 25°. 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 Bar Harbor. See also: January | February | March.
