May weather forecast
Brussels, Belgium

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A beautiful slope garden with several museums, in the city of Brussels, Belgium
A beautiful slope garden with several museums, in the city of Brussels, Belgium

Weather in May

A transition to summer begins in May, with conditions warming up nicely in Brussels, Belgium. Significantly higher averages in temperature are registered, with highs reaching 18.1°C (64.6°F). The city now revels in more sunlight hours, even as rainfall persists. Pleasantly balmy days replace the harsh cold, as May embodies the essence of late spring or early summer. Despite this, it's advisable to pack light sweaters or jackets due to the still-cool temperatures during the night.

Temperature

The average high-temperature in Brussels mildly increases in May, edging from a mild 14.2°C (57.6°F) in April to a still refreshing 18.1°C (64.6°F). In Brussels, the average low-temperature during the month of May is a frosty 9.2°C (48.6°F).

Humidity

In Brussels, the average relative humidity in May is 73.2%.

Rainfall

In Brussels, in May, it is raining for 16.2 days, with typically 67mm (2.64") of accumulated precipitation. In Brussels, during the entire year, the rain falls for 199.6 days and collects up to 853mm (33.58") of precipitation.

Snowfall

In Brussels, snow does not fall in May through October.

Daylight

In Brussels, the average length of the day in May is 15h and 33min.
On the first day of the month, sunrise is at 06:15 and sunset at 21:04. On the last day of May, in Brussels, sunrise is at 05:34 and sunset at 21:46 CEST.

Sunshine

In May, the average sunshine is 6.2h.

UV index

The average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: An average maximum UV index of 6 in May leads to these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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Frequently asked questions

What are May temperatures in Brussels?

May temperatures in Brussels, Belgium, vary between a high-temperature of 18.1°C (64.6°F) and a low-temperature of 9.2°C (48.6°F).

What is the average humidity in May in Brussels?

The average relative humidity in May is 73.2%.

How many days does it rain in May in Brussels?

In May, in Brussels, the rain falls for 16.2 days. Throughout May, 67mm (2.64") of precipitation is accumulated.

When it does not snow in Brussels?

May through October are months without snowfall in Brussels, Belgium.

Does it snow in Brussels in May?

In May, in Brussels, Belgium, it doesn't snow. April is the latest month when it typically snows.

What is the average length of the day in May in Brussels?

In Brussels, Belgium, the average day length in May is 15h and 33min.

When is the sunrise / sunset in May in Brussels?

On the first day of May in Brussels, Belgium, sunrise is at 06:15 and sunset at 21:04. On the last day of the month, sunrise is at 05:34 and sunset at 21:46 CEST.

How long on average sun shines in May in Brussels?

In May, the average sunshine duration in Brussels is 6.2h.

How high is the UV index in May in Brussels?

The average daily maximum UV index in May in Brussels, Belgium, is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Brussels, Belgium

Average temperature in May - Brussels, Belgium
  • Average high temperature in May: 18.1°C

The warmest month (with the highest average high temperature) is July (23°C).
The month with the lowest average high temperature is January (5.7°C).

  • Average low temperature in May: 9.2°C

The month with the highest average low temperature is July (14°C).
The coldest months (with the lowest average low temperature) are January and February (0.7°C).

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Average humidity in May
Brussels, Belgium

Average humidity in May - Brussels, Belgium
  • Average humidity in May: 73.2%

The month with the highest relative humidity is December (88.8%).
The month with the lowest relative humidity is April (72.5%).

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Average rainfall in May
Brussels, Belgium

Average rainfall in May - Brussels, Belgium
  • Average rainfall in May: 66.5mm

The wettest month (with the highest rainfall) is December (81mm).
The driest month (with the least rainfall) is April (51.3mm).

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Average rainfall days in May
Brussels, Belgium

Average rainfall days in May - Brussels, Belgium
  • Average rainfall days in May: 16.2 days

The month with the highest number of rainy days is December (19.3 days).
The month with the least rainy days is July (14.3 days).

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Average snowfall days in May
Brussels, Belgium

Average snowfall days in May - Brussels, Belgium
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
Brussels, Belgium

Average daylight in May / Average sunshine in May - Brussels, Belgium
  • Average daylight in May: 15h and 3min

The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).

  • Average sunshine in May: 6h and 1min

The month with the most sunshine is July (Average sunshine: 6h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 30min).

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Average UV index in May
Brussels, Belgium

Average UV index in May - Brussels, Belgium
  • Average UV index in May: 6

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Brussels, Belgium

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