S
M
T
W
T
F
S
30
96°
63°
31
98°
65°
1
100°
69°
2
101°
73°
3
99°
73°
4
100°
73°
5
101°
72°
6
91°
70°
7
88°
63°
8
94°
62°
9
93°
70°
10
79°
67°
11
84°
67°
12
93°
62°
13
87°
64°
14
88°
60°
15
98°
68°
16
95°
73°
17
99°
71°
18
98°
70°
19
97°
69°
20
91°
67°
21
72°
66°
22
74°
61°
23
73°
56°
24
70°
56°
25
73°
56°
26
70°
55°
27
76°
59°
28
81°
53°
29
85°
50°
30
92°
65°
1
91°
66°
2
76°
57°
3
76°
48°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
