Brussels Weather in September
Brussels in September
The short of it: Brussels in September averages a high of 21 °C (69 °F) and a low of 12 °C (53 °F), with 62 mm (2.4 in) of rain and about 12 h 32 min of daylight. Rated 4 of 5 for a visit; the best months are April and June. Source: TerraClimate climate normals, 1991–2020.
Average high 21° · low 12° · rain 62 mm · daylight 12 h 32 min
✦✦✦✦ Recommended for a visit · best months: April & June
Thirty years of records give Brussels an average September high of 21°, a low of 12° and some 62 mm of rain. Much like August: highs about 21°, nights near 12°. Easy travelling weather. Wet spells are common — about 62 mm, the 9th wettest month.
The sun is up for about 12 h 32 min in mid-September, 119 minutes less than a month before.
For the traveller: pack light clothes and a jacket for the evening, and an oilskin besides. The Almanac rates September 4 of 5 for a visit; the finest months here are April and June.
Against its neighbours, Brussels runs warmer than most and wetter than most in September. Ixelles, 2 km to the SSE, is 1° cooler by day.
September in Brussels, by the numbers
- Warmth rank
- 4th warmest of 12
- Rain rank
- 9th wettest of 12
- Versus August
- 4° colder, 17 mm less rain
- Versus October
- 5° warmer
- Day–night spread
- 9°
- Snow season
- seldom any
- Daylight, mid-month
- 12 h 32 min
- Average wind
- 11 km/h
Neighbouring Towns
September averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| IxellesBrussels Capital | 2 km SSE | 20° | 11° | 62 mm |
| Molenbeek-Saint-JeanBrussels Capital | 3 km W | 20° | 11° | 62 mm |
| Saint-GillesBrussels Capital | 3 km S | 20° | 11° | 62 mm |
| JetteBrussels Capital | 3 km NNW | 21° | 12° | 62 mm |
| AnderlechtBrussels Capital | 3 km WSW | 20° | 11° | 62 mm |
| SchaerbeekBrussels Capital | 3 km NE | 20° | 11° | 62 mm |
| EtterbeekBrussels Capital | 3 km SE | 20° | 11° | 62 mm |
| ForestBrussels Capital | 4 km SSW | 20° | 11° | 61 mm |