August 21 is generally a great time to visit Brussels. While there is a slight chance of rain (22%), showers are usually brief. Expect comfortable 23°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 August 21
"Mild & Comfortable. Expect average highs of 22.9°C. 22% chance of rain."
What to Wear in Brussels in August
Based on historical data for August 21, Brussels typically experiences temperatures between 14.4°C and 22.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (22% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Brussels
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
22.9°C
Daytime Peak
Average Low
14.4°C
Nighttime Low
Feels Like
23.4°C
☀️ Feels accurate
Rain Chance
22%
Avg 1.5mm if it rains
Cloud Cover
60%
Overcast
Pressure
1016.6 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 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 24 min to burn
Type III-IV
🟡 36 min to burn
Type V-VI
🟢 60 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17.8°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
92/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~564
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Brussels
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:40
☀️ Noon
12:47
🌇 Sunset
19:54
⏱️ Daylight
14h 14m
Wind Speed
16 km/h
Gentle breeze
Sunshine
10.2 hrs
Direct Sun (Cloud-free)
Humidity
73%
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
🔴 Very 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 August 21 averages 22.9°C with a 22% precipitation probability. Wedding/Outdoor Event Score: 97/100."
— 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
Compare Other Cities
Same date (August 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Brussels Worth Visiting on August 21?
Planning a trip to Brussels on August 21? 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 22.9°C with a 22% historical precipitation risk.
✈️ Travel Logistics: Approximately 564 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 August 21 recorded in the last 30 years saw temperatures hit 27.6°C in 2020, while the coldest dropped to 9.5°C in 2019.