Weather in Brussels in September
September in Brussels is mild enough that walking is the default. This is a city-break month more than a sea-holiday month.
In Belgium, this is how Brussels actually wears September, not how a country centroid would. Compared with July and January, September sits in the middle of Brussels's year.
- Average temp
- 15°C
11–20°C
- Rainfall
- 67 mm
Showers likely
- Sunshine
- 5.1 h
hours per day
What to expect
Daytime
Mild afternoons in Brussels are the prize in September. You can eat outside on the good days. You still want something for the breeze.
This is walking weather. Shade is useful, not essential the way it is in the hot months. A long outdoor day is a reasonable plan.
Rain
September is on the drier side of the year in Brussels. Showers are possible. They do not define the month.
A shell that lives in the bag is enough. This is not December, and it should not be packed as if it were.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Rain jacket
A layer for cooler evenings
Where to stay in Brussels
Dates are a starting point for September.
Travel guides for Brussels
What to read before you book.
Average weather in Brussels
TemperatureRainfall
Similar weather in September
Other destinations whose September averages sit close to this one.
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FAQs about Brussels
Climate averages for Brussels, 1991–2020.
The best time to visit Brussels is between May and October, the most comfortable stretch of the year on these averages.
July is the hottest month, with an average around 19°C.
August is the wettest month, with about 90 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
