S
M
T
W
T
F
S
29
51°
40°
30
55°
42°
1
56°
41°
2
55°
41°
3
56°
40°
4
50°
38°
5
54°
35°
6
52°
39°
7
55°
37°
8
46°
34°
9
45°
32°
10
43°
29°
11
42°
35°
12
43°
34°
13
47°
33°
14
42°
27°
15
43°
29°
16
43°
32°
17
45°
33°
18
44°
35°
19
52°
32°
20
51°
23°
21
44°
25°
22
39°
26°
23
38°
30°
24
42°
28°
25
50°
27°
26
50°
21°
27
40°
21°
28
36°
24°
29
39°
23°
30
40°
33°
31
47°
29°
1
53°
23°
2
48°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Interlaken
Interlaken's December 2026 forecast shows daily high temperatures ranging from 36° to 56°, with overnight lows between 20° and 42°. The average high for December is 47° with an average low of 31°. 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 Interlaken. See also: January | February | March.
