Brussels · AutumnMonth summary
Brussels weather in September
✅ Good
🌡️ Temperature min / max
12°C – 20°C
🌧 Rainy days
35% of days
☀️ Sunshine
9.9h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.3/10
📅 📅 Best month
July (7.9/10)
Quick decision
Should you visit Brussels in September?
✅ Good
✅ Yes if: you want to explore the city on foot without suffering from heat.
❌ No if: you're looking for a beach destination — water and air are still cool.
Our take: September is a good time to visit Brussels. July remains slightly better (+0.6 pts).
By trip type
Brussels in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Good period — 20°C with good sunshine. Reasonable crowds Autumn in Brussels is often underrated: 20°C, golden light and declining crowds. An interesting window. Expect rain on 35% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. July (7.9/10) is significantly better if possible.
Browse by month
All months for Brussels
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 2°C | 6°C | 44% | 2.6 | 2.8h | 2.0/10 |
| 🌦️ February | 2°C | 9°C | 43% | 2.3 | 5.5h | 4.0/10 |
| 🌦️ March | 4°C | 11°C | 41% | 2.2 | 8.3h | 4.6/10 |
| ⛅ April | 5°C | 14°C | 36% | 1.5 | 10.7h | 6.9/10 |
| 🌤️ May | 9°C | 18°C | 37% | 2.0 | 12.0h | 7.2/10 |
| 🌤️ June | 13°C | 22°C | 36% | 2.4 | 12.5h | 7.8/10 |
| 🌤️ July | 14°C | 22°C | 35% | 2.3 | 12.9h | 7.9/10 |
| 🌤️ August | 15°C | 23°C | 36% | 1.8 | 11.7h | 7.8/10 |
| 🌤️ September | 12°C | 20°C | 35% | 2.0 | 9.9h | 7.3/10 |
| 🌦️ October | 10°C | 15°C | 41% | 2.5 | 6.2h | 5.1/10 |
| 🌦️ November | 5°C | 10°C | 45% | 2.2 | 4.4h | 4.0/10 |
| 🌦️ December | 3°C | 8°C | 44% | 2.4 | 2.8h | 2.6/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Brussels averages 20°C, 35% rainy days and 9.9h of sunshine per day. Overall weather score: 7.3/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 7.9/10). Difference:
- 🌡️ Max temperature : +2°C
- 🌧 Rainy days : +0%
- ☀️ Sunshine : +3.0h/day
FAQ
FAQ — Brussels in September
Is September a good time to visit Brussels?
September is an acceptable time for Brussels (score 7.3/10). Conditions are decent but not optimal — consider July (7.9/10) if possible.
What to do in Brussels in September?
With 20°C max and 9.9h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Brussels
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