S
M
T
W
T
F
S
30
69°
60°
31
69°
59°
1
70°
61°
2
72°
61°
3
76°
62°
4
76°
62°
5
75°
60°
6
76°
61°
7
73°
60°
8
71°
59°
9
72°
60°
10
74°
59°
11
73°
59°
12
74°
58°
13
74°
59°
14
73°
59°
15
74°
58°
16
72°
58°
17
70°
57°
18
71°
57°
19
72°
56°
20
70°
57°
21
71°
53°
22
71°
49°
23
69°
45°
24
66°
48°
25
70°
50°
26
69°
51°
27
68°
54°
28
69°
55°
29
71°
55°
30
71°
46°
1
70°
42°
2
62°
49°
3
65°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brussels
Brussels's September 2026 forecast shows daily high temperatures ranging from 62° to 76°, with overnight lows between 42° and 62°. The average high for September is 71° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Brussels. See also: October | November | December.
