Weather in Brussels in September
In an average September, Brussels sees a daily high around 19°C and a low around 11°C, based on 1980–2026 of local climate records.
| Average high | 19°C |
|---|---|
| Typical high range | 15°C to 25°C |
| Average low | 11°C |
| Typical low range | 8°C to 15°C |
| Average daily precipitation | 3 mm |
September records
The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
33°C
2020-09-15
Lowest
11°C
1993-09-27
Low
Highest
19°C
2025-09-20
Lowest
2°C
2018-09-30
Feels-like
Highest
41°C
2024-09-01
Lowest
-2°C
2018-09-30
Humidity
Highest
16.8 g/m³
2024-09-01
Lowest
6.6 g/m³
1990-09-16
Wind
Highest
44 km/h
1981-09-20
Lowest
5 km/h
1988-09-20
Gust
Highest
92 km/h
1981-09-20
Lowest
12 km/h
1996-09-23
Precip
Wettest
146 mm
1998
Driest
17 mm
1997
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