Belgium Brussels Weather in May — Climate Guide
May in Brussels is very-high
May is very-high for Brussels.
May is one of the best months in Brussels — warm, long-dayed, and lively, with the city outdoors. It averages 18°C/9°C with 65mm of rain, much of it in passing showers.
The parks are at their greenest and café terraces are full. The Royal Greenhouses of Laeken often stay open into early May (check dates). The Brussels Jazz Weekend, with free concerts across the city, usually lands in late May, and the Iris Festival celebrates the Brussels-Capital Region with events and open days.
Travel score
Brussels May Weather Stats
Avg High
18°C
Avg Low
9°C
Rainy Days
15
65mm total
Sunshine
6.2h
Daily avg
Humidity
71%
comfortable
UV Index
5
Moderate
Wind
14 km/h
Gusts 28
Crowds
Busy
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
16 μg/m³
PM10
26 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
18°C
Nighttime
9°C
Humidity and wind affect how the actual temperature feels.
Wind
14 km/h
Max gust 28 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Warm, long days and lively city
- Festivals (Brussels Jazz Weekend, Iris Festival)
- Parks and terraces at their best
- Possible late Greenhouses of Laeken opening
Cons
- Higher prices and more visitors
- Public-holiday closures possible
- Still occasional grey, showery days
- Book ahead
May Events & Festivals
- Public holidays (Labour Day May 1, often Ascension)
- Brussels Jazz Weekend (late May)
- Iris Festival (Brussels Region's celebration, early-mid May)
- Café and park season in full swing
Brussels in May — Full Picture
May is one of the best months in Brussels — warm, long-dayed, and lively, with the city outdoors. It averages 18°C/9°C with 65mm of rain, much of it in passing showers.
The parks are at their greenest and café terraces are full. The Royal Greenhouses of Laeken often stay open into early May (check dates). The Brussels Jazz Weekend, with free concerts across the city, usually lands in late May, and the Iris Festival celebrates the Brussels-Capital Region with events and open days.
May has several public holidays (Labour Day on May 1, and Ascension, which varies), which can mean some closures and busier weekends but also a festive feel.
Daylight is long (sunset after 9pm by late May) and the weather is at its most pleasant, though Belgium can still throw a grey, showery day at you, so keep a rain layer. It's a popular, higher-priced time — book ahead.
Note: this is peak shoulder-to-high season; expect more visitors and firmer prices than the quiet winter months.
What to Wear & What to Pack
Warm spring — around 18°C/9°C. Light clothing with a jacket or sweater for evenings, plus a rain jacket for showers. Comfortable by day, fresh after dark.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current14.3°C
5.7°C
15.3/mo
Summer (Jun·Jul·Aug)
22.3°C
13.3°C
13.3/mo
Autumn (Sep·Oct·Nov)
15°C
7.7°C
15/mo
Winter (Dec·Jan·Feb)
6.7°C
1.3°C
17.7/mo
Brussels Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 6° | 1° | 19d·75mm | 1.8h | 86% | 1 | Quiet | Low season | |
| 7° | 1° | 16d·65mm | 2.6h | 83% | 1 | Quiet | Low season | |
| 11° | 3° | 16d·65mm | 3.8h | 78% | 2 | Moderate | Shoulder | |
| 14° | 5° | 15d·55mm | 5.2h | 73% | 4 | Busy | Peak | |
| May (Best) | 18° | 9° | 15d·65mm | 6.2h | 71% | 5 | Busy | Peak |
| June (Best) | 21° | 12° | 14d·70mm | 6.6h | 70% | 6 | Busy | Peak |
| July (Best) | 23° | 14° | 13d·75mm | 7h | 71% | 6 | Very busy | Peak |
| August (Best) | 23° | 14° | 13d·75mm | 6.4h | 73% | 5 | Very busy | Peak |
| 20° | 11° | 13d·60mm | 5h | 76% | 4 | Busy | Shoulder | |
| 15° | 8° | 15d·75mm | 3.6h | 82% | 2 | Moderate | Shoulder | |
| 10° | 4° | 17d·75mm | 2h | 86% | 1 | Moderate | Shoulder | |
| 7° | 2° | 18d·80mm | 1.6h | 87% | 1 | Busy | Peak |
View Other Months
Brussels May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Brussels?
Brussels in May is very-high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Brussels in May?
Brussels May averages a high of 18°C and a low of 9°C.
Does it rain much in Brussels in May?
Brussels May averages 65mm of rainfall over about 15 rainy days.
What should I wear in Brussels in May?
Warm spring — around 18°C/9°C. Light clothing with a jacket or sweater for evenings, plus a rain jacket for showers. Comfortable by day, fresh after dark.
What time are sunrise and sunset in Brussels in May?
Brussels May sunrise is 05:55 and sunset is 21:10, with 15h 15min of daylight.
What's the air quality like in Brussels in May?
Brussels May air quality (AQI) averages 42, rated Good. PM2.5 averages 16μg/m³.
What activities are recommended in Brussels in May?
In May, Brussels is great for Brussels Jazz Weekend (late May), Parks and café terraces, Day trips to Bruges, Ghent, Antwerp.
Is May peak season in Brussels?
Brussels May crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Brussels
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.