S
M
T
W
T
F
S
29
55°
39°
30
55°
39°
1
54°
31°
2
40°
29°
3
44°
33°
4
53°
35°
5
51°
36°
6
41°
28°
7
39°
24°
8
37°
23°
9
38°
26°
10
44°
30°
11
45°
29°
12
49°
30°
13
46°
29°
14
39°
25°
15
42°
26°
16
42°
29°
17
41°
27°
18
39°
21°
19
38°
20°
20
36°
18°
21
34°
20°
22
35°
26°
23
40°
25°
24
37°
25°
25
36°
17°
26
36°
18°
27
35°
18°
28
35°
17°
29
34°
23°
30
34°
20°
31
35°
16°
1
36°
12°
2
33°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Brussels
Brussels's December 2026 forecast shows daily high temperatures ranging from 33° to 55°, with overnight lows between 12° and 39°. The average high for December is 41° 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 Brussels. See also: January | February | March.
