Climate averages 1991–2020
Brussels weather
in May.
A mild, moderately wet month: the 5th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Brussels: daytime highs average 17.8°C and nights cool to about 9.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 62 mm of rain on roughly 12 days, which makes May a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 30 min on an average May day.
The nearest other city in this atlas is Ixelles (2 km away). In May its highs average 17.5°C, about as warm as Brussels, with 62 mm of rain.
Among the 18 cities listed in Belgium, Brussels ranks joint 6th of 18 for the warmest May highs and joint 7th of 18 for the driest May (rainfall, lowest first). The mean May high of those 18 cities is 17.6°C; Brussels is 0.2°C warmer than that mean.
From May to June, average highs rise by 2.8°C to 20.6°C, and monthly rainfall rises from 62 mm to 65 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Brussels climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.1°C1.4°C | 1.4°C | 63 | 12.0 | 8.58 h |
| February | 7.2°C1.4°C | 1.4°C | 58 | 11.4 | 10.010 h |
| March | 10.6°C3.1°C | 3.1°C | 56 | 11.8 | 11.812 h |
| April | 14.4°C5.4°C | 5.4°C | 48 | 11.4 | 13.814 h |
| May, selected | 17.8°C9.1°C | 9.1°C | 62 | 12.2 | 15.515 h |
| June | 20.6°C12.1°C | 12.1°C | 65 | 11.5 | 16.416 h |
| July | 22.6°C14.3°C | 14.3°C | 70 | 12.2 | 16.016 h |
| August | 22.5°C14.2°C | 14.2°C | 73 | 12.1 | 14.615 h |
| September | 19.2°C11.7°C | 11.7°C | 54 | 10.5 | 12.713 h |
| October | 14.9°C8.7°C | 8.7°C | 58 | 11.2 | 10.811 h |
| November | 9.9°C5.0°C | 5.0°C | 64 | 11.9 | 9.09 h |
| December | 6.6°C2.2°C | 2.2°C | 74 | 13.0 | 8.08 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Ixelles in MayBelgium · 2 kmHigh 17.5°C · Low 8.8°C · 62 mm rain
- Anderlecht in MayBelgium · 3 kmHigh 17.9°C · Low 9.2°C · 62 mm rain
- Schaerbeek in MayBelgium · 3 kmHigh 17.8°C · Low 9.1°C · 64 mm rain
- Mechelen in MayBelgium · 21 kmHigh 18.1°C · Low 9.3°C · 59 mm rain
- Aalst in MayBelgium · 24 kmHigh 17.8°C · Low 9.3°C · 60 mm rain
- Leuven in MayBelgium · 25 kmHigh 17.9°C · Low 9.1°C · 59 mm rain
- Antwerp in MayBelgium · 41 kmHigh 17.8°C · Low 9.4°C · 62 mm rain
- La Louvière in MayBelgium · 42 kmHigh 17.2°C · Low 8.5°C · 65 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Brussels) is explained once on the Brussels year overview and on the Sources, method and limits page.
Anderlecht and Ixelles lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.