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