S
M
T
W
T
F
S
30
78°
68°
31
86°
68°
1
86°
71°
2
81°
66°
3
73°
66°
4
77°
68°
5
77°
64°
6
77°
57°
7
78°
57°
8
73°
65°
9
82°
66°
10
74°
58°
11
76°
57°
12
78°
62°
13
68°
54°
14
67°
44°
15
76°
59°
16
69°
52°
17
69°
56°
18
64°
57°
19
60°
58°
20
63°
52°
21
59°
52°
22
62°
51°
23
65°
47°
24
68°
48°
25
71°
50°
26
69°
48°
27
69°
52°
28
72°
54°
29
71°
57°
30
69°
57°
1
67°
53°
2
66°
55°
3
64°
53°
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 64° to 72°, with overnight lows between 48° and 57°. The average high for September is 69° with an average low of 53°. 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.
