September · Belgium
Best time to visit Brussels in September Weather, crowds & prices
Weather in Brussels in September
Average temperature 17°C, 95 mm of rain, about 9 days with 6+ hours of sunshine and 80% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.1/10
Ranked #6 of 12 months
- Avg temp
- 17°C
- Rainfall
- 95 mm
- Humidity
- 80%
- Days with 6h+ sun
- 9
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Brussels scores 7.1/10 for sightseeing and cultural travel - an above-average month (#6 of 12). Expect around 17°C, 95 mm of rain, and roughly 9 days with 6+ hours of sunshine this month.
Grand Place grandeur, chocolate shops, and Art Nouveau streets peak May through September.
September in Brussels — reliably good (6th best month)
Temperatures hover around 17°C (62°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 95 mm of rain this month — a flexible day or two helps — with about 9 days with 6+ hours of sunshine and 12.4 hours of daylight to work around it.
That is 7.1/10 on the same scale — 6th of 12 months, versus 8.9/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in Brussels — 1.8 points higher on the same scale.
Frequently asked
- What is the weather like in Brussels in September?
- In September, Brussels averages 17°C, 95 mm of rain, and about 9 days with 6+ hours of sunshine. Its climate-comfort score is 7.1/10.
- Is September a good time to visit Brussels?
- September earns a 7.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Brussels in September?
- Expect about 95 mm of rain in September. Average humidity is 80% and there are about 9 days with 6+ hours of sunshine.
Curated in Brussels
Tickets & experiences
Things to do in Brussels
Brussels, Belgium. Live activities and tours from GetYourGuide, matched to this destination.