May weather forecast and climate
Rotterdam, Netherlands

An old ship dock in Rotterdam, Netherlands, overlooking the Williamsburg Bridge and the famous Openlucht Binnenvaart museum
An old ship dock in Rotterdam, Netherlands, overlooking the Williamsburg Bridge and the famous Openlucht Binnenvaart museum

Weather in May

The last month of the spring, May, is a comfortable month in Rotterdam, Netherlands, with average temperature varying between 16.8°C (62.2°F) and 9.5°C (49.1°F).

Temperature

In May, the average high-temperature is practically the same as in April - an enjoyable 16.8°C (62.2°F). In Rotterdam, in May, the average low-temperature is 9.5°C (49.1°F).

Humidity

In Rotterdam, Netherlands, the average relative humidity in May is 75%.

Rainfall

In Rotterdam, in May, it is raining for 11.9 days, with typically 13mm (0.51") of accumulated precipitation. In Rotterdam, during the entire year, the rain falls for 130.3 days and collects up to 205mm (8.07") of precipitation.

Snowfall

In Rotterdam snow does not fall in April through October.

Daylight

In Rotterdam, Netherlands, the average length of the day in May is 15.7h.

Sunshine

In May, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 in May transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in May in Rotterdam?

In May, the average relative humidity is 75%.

How many days does it rain in May in Rotterdam?

In May, the rain falls for 11.9 days. Throughout May, 13mm (0.51") of precipitation is accumulated.

When it does not snow in Rotterdam?

In Rotterdam, Netherlands, snow does not fall in April through October.

How many hours of daylight does Rotterdam have in May?

In Rotterdam, the average length of the day in May is 15.7h.

How many hours of sunshine does Rotterdam have in May?

In May, the average sunshine in Rotterdam, Netherlands, is 8.5h.

What is the UV index intensity in May in Rotterdam?

The average daily maximum UV index in May in Rotterdam, Netherlands, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in May
Rotterdam, Netherlands

Average temperature in May - Rotterdam, Netherlands
  • Average high temperature in May: 16.8°C

The warmest months (with the highest average high temperature) are July and August (22°C).
The month with the lowest average high temperature is January (5.6°C).

  • Average low temperature in May: 9.5°C

The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).

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Average pressure in May
Rotterdam, Netherlands

Average pressure in May - Rotterdam, Netherlands
  • Average pressure in May: 1016.6mbar

The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is November (1011.4mbar).

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Average wind speed in May
Rotterdam, Netherlands

Average wind speed in May - Rotterdam, Netherlands
  • Average wind speed in May: 14.5km/h

The windiest month (with the highest average wind speed) is December (20.2km/h).
The calmest months (with the lowest average wind speed) are July and August (13.6km/h).

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Average humidity in May
Rotterdam, Netherlands

Average humidity in May - Rotterdam, Netherlands
  • Average humidity in May: 75%

The month with the highest relative humidity is December (85%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in May
Rotterdam, Netherlands

Average rainfall in May - Rotterdam, Netherlands
  • Average rainfall in May: 13mm

The wettest month (with the highest rainfall) is June (24mm).
The driest month (with the least rainfall) is April (9mm).

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Average rainfall days in May
Rotterdam, Netherlands

Average rainfall days in May - Rotterdam, Netherlands
  • Average rainfall days in May: 11.9 days

The month with the highest number of rainy days is July (13.8 days).
The month with the least rainy days is February (8.5 days).

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Average snowfall in May
Rotterdam, Netherlands

Average snowfall in May - Rotterdam, Netherlands
  • Average snowfall in May: 0mm

The month with the highest snowfall is February (19mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in May
Rotterdam, Netherlands

Average snowfall days in May - Rotterdam, Netherlands
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (2.2 days).
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
Rotterdam, Netherlands

Average daylight in May / Average sunshine in May - Rotterdam, Netherlands
  • Average daylight in May: 15.7h

The month with the longest days is June (Average daylight: 16.6h).
The month with the shortest days is December (Average daylight: 7.9h).

  • Average sunshine in May: 8.5h

The month with the most sunshine is June (Average sunshine: 9.8h).
The month with the least sunshine is December (Average sunshine: 3.5h).

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Average sunshine days in May
Rotterdam, Netherlands

Average sunshine days in May - Rotterdam, Netherlands
  • Average sunshine days in May: 14.7 days

The month with the most sunshine days is April (17.5 days).
The month with the least sunshine days is July (13 days).

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Average UV index in May
Rotterdam, Netherlands

Average UV index in May - Rotterdam, Netherlands
  • Average UV index in May: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Rotterdam, Netherlands

Average cloud cover in May - Rotterdam, Netherlands
  • Average cloud cover in May: 43

The month with the most cloud cover is December (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 40).

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Average visibility in May
Rotterdam, Netherlands

Average visibility in May - Rotterdam, Netherlands
  • Average visibility in May: 10km

Months with the highest visibility are April, May, June and August (10km).
Months with the lowest visibility are January, February, March, July, September, October, November and December (9km).

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