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