S
M
T
W
T
F
S
29
40°
31°
30
42°
34°
1
43°
33°
2
42°
32°
3
42°
30°
4
31°
16°
5
32°
30°
6
48°
26°
7
49°
22°
8
41°
18°
9
34°
16°
10
31°
13°
11
31°
14°
12
30°
16°
13
30°
16°
14
31°
20°
15
31°
20°
16
35°
26°
17
37°
22°
18
44°
17°
19
39°
15°
20
29°
13°
21
29°
15°
22
28°
14°
23
28°
17°
24
30°
21°
25
33°
23°
26
36°
25°
27
43°
26°
28
44°
23°
29
43°
22°
30
39°
22°
31
39°
20°
1
38°
16°
2
33°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Seal Harbor
Seal Harbor's December 2026 forecast shows daily high temperatures ranging from 28° to 49°, with overnight lows between 13° and 34°. The average high for December is 36° with an average low of 21°. 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 Seal Harbor. See also: January | February | March.
