Lisbon
Portugal
Long-term weather forecast
Long-term weather forecast

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
Lisbon is fairly warm in May, with an average temperature of 18.3°C (64.9°F). The Bars, along with Tagus River, host numerous wine lovers at this time of year. One can comfortably stay out late on Lisbon streets, savoring the excellent wines Portugal has to offer.

What is the temperature in May in Lisbon?

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

How many days does it rain in May in Lisbon?

In Lisbon, during May, the rain falls for 8 days and regularly aggregates up to 53.6mm (2.1") of 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 swimming, a surface water temperature of 17.4°C (63.3°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

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

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

How many hours of sunshine does Lisbon have in May?

The average sunshine in May in Lisbon is 9h.

What is the UV index reading in May in Lisbon?

The average daily maximum UV index in May in Lisbon is 8. A UV Index reading of 8 to 10 represents a very high health threat from the exposure to the Sun's 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 lowest 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 lowest number of 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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 9h

Months with most sunshine are July and August (Average sunshine: 11h).
Months with 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).