May weather forecast and climate
Lisbon, Portugal

The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle
The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle
May, the last month of the spring, in Lisbon, is an agreeable month, with average temperature fluctuating between 22.1°C (71.8°F) and 13.9°C (57°F).

Temperature

In Lisbon, Portugal, the average high-temperature is essentially the same as in April - an agreeable 22.1°C (71.8°F). In Lisbon, Portugal, in May, the average low-temperature is 13.9°C (57°F).

Rainfall

In Lisbon, during 8 rainfall days, 53.6mm (2.11") of precipitation is typically accumulated. Throughout the year, in Lisbon, there are 112 rainfall days, and 774mm (30.47") of precipitation is accumulated.

Sea temperature

In Lisbon, the average seawater temperature is 17.4°C (63.3°F).
Note: For most, swimming in 17.4°C (63.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

In May, the average length of the day in Lisbon is 14.3h.

Sunshine

The average sunshine in Lisbon is 9h.

UV index

The average daily maximum UV index in Lisbon is 8. A UV Index of 8 to 10 symbolizes a very high health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 8 transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in May in Lisbon?

The average high-temperature, in May, in Lisbon, Portugal, is 22.1°C (71.8°F), while the average low-temperature is 13.9°C (57°F).

How many days does it rain in May in Lisbon?

In Lisbon, in May, it is raining for 8 days, with typically 53.6mm (2.11") of accumulated precipitation.

How cold is the water in May in Lisbon?

In Lisbon, Portugal, the average seawater temperature in May is 17.4°C (63.3°F). For most, swimming in 17.4°C (63.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

How many hours of daylight does Lisbon have in May?

In May, the average length of the day in Lisbon, Portugal, is 14.3h.

How many hours of sunshine does Lisbon have in May?

In May, the average sunshine in Lisbon is 9h.

What is the UV index reading in May in Lisbon?

In May, the average daily maximum UV index in Lisbon is 8. A UV Index estimate of 8 to 10 represents a very high hazard to health from unprotected exposure to the UV radiation.
Average temperature in May - Lisbon, Portugal
  • Average high temperature in May: 22.1°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (14.8°C).

  • Average low temperature in May: 13.9°C

The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is January (8.3°C).

Average rainfall in May - Lisbon, Portugal
  • Average rainfall in May: 53.6mm

The wettest month (with the highest rainfall) is November (127.6mm).
The driest month (with the least rainfall) is July (4.2mm).

Average rainfall days in May - Lisbon, Portugal
  • Average rainfall days in May: 8 days

Months with the highest number of rainy days are January, February and December (14 days).
Months with the least rainy days are July and August (2 days).

Average sea temperature in May - Lisbon, Portugal
  • Average sea temperature in May: 17.4°C

The best month for swimming (with the highest average sea temperature) is September (19.9°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).

Average daylight in May / Average sunshine in May - Lisbon, Portugal
  • Average daylight in May: 14.3h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 9h

Months with the most sunshine are July and August (Average sunshine: 11h).
Months with the least sunshine are January, February, November and December (Average sunshine: 5).

Average UV index in May - Lisbon, Portugal
  • Average UV index in May: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).