The month in detail
What to expect in September
Autumn in Brussels is often underrated: 20°C, golden light and declining crowds. An interesting window. Expect rain on 27% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. August (7.9/10) is significantly better if possible.
September ranks 4 out of 12 months in Brussels. Compared to August: −3°C daytime, −1.0h of sun per day.
This month's conditions
What it's like in September
UV index
4 · moderate
protect during midday hours
Feels like
comfortable
11°
Daylight
12.4h of daylight
Air quality
good
AQI 26
Compare
Is September the right month?
The best month in Brussels is August (7.9/10), 0.5 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Brussels
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Brussels
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · Belgium
🗣️LanguageDutch
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthAugust · 23°C
❄️Coolest monthJanuary · 6°C
🌧️Rainiest month ⓘJanuary · 33%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
🛂VisaSchengen · 90 days
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Brussels ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
BelgiumTemperate oceanic climate with a 7.9 → 0.8 gap between best and worst month. 10 years of ERA5 data to choose by project.
50.85°N · 4.35°E
Questions
Frequently asked questions
What is the best time to visit Brussels?
August is the best month with 23.0°C highs, 15.0°C lows, 6.2h of sunshine and 27.0% rainy days. The months of August & June offer comparable conditions.
How many hours of sunshine does Brussels get in August?
Brussels averages 6.2 sunshine hours per day in August. It is the sunniest month with a climate score of 7.4/10.
What is the rainiest month in Brussels?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Brussels in August?
In August, overnight lows reach 15.0°C, while afternoon highs average 23.0°C.
Is Brussels good in winter?
In winter (December-February), Brussels scores 1.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains August with a score of 7.4/10.
When should you avoid Brussels?
January is the most difficult month to visit Brussels, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in Brussels in September?
The average UV index reaches 4 in September in Brussels (moderate), with about 12.4h of daylight. Protect during midday hours.