Weather in Brussels, Brussels Capital, Belgium in September
In an average September, Brussels sees a daily high around 20°C and a low around 11°C, based on 1981–2026 of local climate records.
| Average high | 20°C |
|---|---|
| Typical high range | 16°C to 25°C |
| Average low | 11°C |
| Typical low range | 7°C to 14°C |
| Average daily precipitation | 3 mm |
September records
The most extreme September on record for each metric, across 1981–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
33°C
2020-09-15
Lowest
11°C
1996-09-22
Low
Highest
19°C
2023-09-10
Lowest
4°C
2018-09-29
Feels-like
Highest
39°C
2020-09-15
Lowest
0°C
2024-09-29
Humidity
Highest
17.3 g/m³
2024-09-01
Lowest
6.3 g/m³
2018-09-29
Wind
Highest
55 km/h
2012-09-24
Lowest
4 km/h
1988-09-20
Precip
Wettest
169 mm
2001
Driest
19 mm
2006
See Brussels's live weather grade →
Visiting Brussels in September? See how its comfort stacks up against where you live.
Compare Brussels with your city →