Brussels weather in September
Brussels in September averages 15°C (60°F), 67 mm of rain and 5.1 hours of sun a day.
Of the twelve months in Brussels, September is the fourth warmest, the fifth driest and the sixth sunniest.
- Average temp
- 15°C (60°F)
11–20°C · 52–67°F
- Rainfall
- 67 mm
Showers likely
- Sunshine
- 5.1 h
hours per day
What is Brussels like in September?
Daytime
Days are mild.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Brussels in September?
A light rain jacket
About 67 mm falls this month — showers rather than washouts.
A warm mid-layer
Nights drop to around 11°C (52°F).
September compared with August and October
September in Brussels is 3.1°C cooler than August and 23 mm drier than it, which averages 18°C (65°F).
September in Brussels is 3.9°C warmer than October and about as wet as it, which averages 11°C (53°F).
Daylight in Brussels in September
On 15 September the sun is up for 12 hours 37 minutes in Brussels, rising about 07:18 and setting about 19:55 local time.
September ends 1 hour 50 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 3 hours 53 minutes short of June, the longest-lit month here.
Where to stay in Brussels
Dates are a starting point for September.
Travel guides for Brussels
What to read before you book.
Brussels weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 4°C / 39°F | 77 mm |
| February | 4°C / 40°F | 67 mm |
| March | 7°C / 45°F | 59 mm |
| April | 10°C / 51°F | 47 mm |
| May | 14°C / 57°F | 61 mm |
| June | 17°C / 62°F | 72 mm |
| July | 19°C / 66°F | 80 mm |
| August | 18°C / 65°F | 90 mm |
| September | 15°C / 60°F | 67 mm |
| October | 11°C / 53°F | 71 mm |
| November | 7°C / 45°F | 75 mm |
| December | 4°C / 39°F | 89 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Brussels in September
September climate averages for Brussels, 1991–2020.
Brussels averages 15°C (60°F) in September, ranging from about 11°C (52°F) at night to 20°C (67°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 67 mm falls across September, enough to need a light jacket but not enough to reshape a trip.
Yes. September averages 15°C (60°F) against 11°C (53°F) in October — 3.9°C warmer.
September is 3.1°C cooler than August, and 23 mm drier.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 5.1 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 37 minutes of daylight in mid-September, against 16 hours 30 minutes in June and 7 hours 58 minutes in December.
On 15 September, sunrise is about 07:18 and sunset about 19:55 local time. Both shift across the month — the month ends 1 hour 50 minutes shorter than it starts.
