September 25 is generally a great time to visit Brussels. While there is a slight chance of rain (25%), showers are usually brief. Expect comfortable 18°C weather. As it's peak season for Brussels, we recommend booking your stay well in advance to secure the best rates.
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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 25
"Mild & Comfortable. Expect average highs of 18°C. 25% chance of rain."
What to Wear in Brussels in September
Based on historical data for September 25, Brussels typically experiences temperatures between 10.8°C and 18°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (25% 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
18°C
Daytime Peak
Average Low
10.8°C
Nighttime Low
Feels Like
18°C
🌤️ Feels accurate
Rain Chance
25%
Avg 1.4mm if it rains
Cloud Cover
63%
Overcast
Pressure
1015.3 hPa
High volatility
Brussels Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 89% 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
🔴 38 min to burn
Type III-IV
🟡 57 min to burn
Type V-VI
🟢 95 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
14.5°C
Pleasant
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
06:34
☀️ Noon
12:35
🌇 Sunset
18:37
⏱️ Daylight
12h 2m
Wind Speed
17.8 km/h
Gentle breeze
Sunshine
7.7 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Brussels
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
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
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
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 25 averages 18°C with a 25% precipitation probability. Wedding/Outdoor Event Score: 91/100."
— 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 20
19.5°C • 14% rain
Score
100
September 18
19.7°C • 17% rain
Score
97
September 19
19.7°C • 17% rain
Score
97
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 25) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Brussels Worth Visiting on September 25?
Planning a trip to Brussels on September 25? 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 18°C with a 25% 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 25 recorded in the last 30 years saw temperatures hit 23.1°C in 2016, while the coldest dropped to 5.3°C in 2018.