September 9 is generally a great time to visit Brussels. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 21°C weather. Expect a bustling atmosphere in Brussels right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for Brussels
Currency
EUR
€ Euro
Language
German
+2 more
Driving
Right side
Safety
High Safety
GPI: 1.526
Brussels Weather Forecast for September 9
"Mild & Comfortable. Expect average highs of 21.1°C. 23% chance of rain."
What to Wear in Brussels in September
Based on historical data for September 9, Brussels typically experiences temperatures between 13.4°C and 21.1°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (23% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Brussels
Smart Suitcase
- Light Jacket
- Long Pants
Average High
21.1°C
Daytime Peak
Average Low
13.4°C
Nighttime Low
Feels Like
21.3°C
☀️ Feels accurate
Rain Chance
23%
Avg 1.2mm if it rains
Cloud Cover
60%
Light drizzle
Pressure
1015.9 hPa
Medium volatility
Brussels Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 80% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 36 min to burn
Type III-IV
🟡 54 min to burn
Type V-VI
🟢 90 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.9°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Belgium
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~610
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Brussels
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:09
☀️ Noon
12:41
🌇 Sunset
19:13
⏱️ Daylight
13h 3m
Wind Speed
17.8 km/h
Gentle breeze
Sunshine
8.7 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Brussels
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Brussels
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Brussels on September 9 averages 21.1°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Brussels Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 2
21.7°C • 19% rain
Score
99
September 3
21.9°C • 20% rain
Score
98
September 4
21.9°C • 24% rain
Score
97
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 9) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Brussels Worth Visiting on September 9?
Planning a trip to Brussels on September 9? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 21.1°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 610 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 7 vaccinations are recommended for Belgium, including COVID-19.
📊 Historical Extremes: The hottest September 9 recorded in the last 30 years saw temperatures hit 30.4°C in 2023, while the coldest dropped to 7.6°C in 2019.