What to Wear in Brussels in September
Cooling, comfortable days. Expect 11°–19°C with 9 rainy days on average.
☀️
High
19°C
🌙
Low
11°C
🌧️
Rain days
9
🌡️
Feel
Mild & Comfortable
Typical outfit
~15°C average
About September in Brussels
September in Brussels typically brings cooling, comfortable days. With averages of 11°–19°C, the conditions call for ideal sightseeing weather! layer smartly — mornings and evenings will be cooler.
Mornings feel cool but afternoons can warm up significantly. A trench or jacket over a lighter outfit is ideal.
September in other cities