May weather forecast
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

Weather in May

May, the last month of the spring in Lisbon, is a pleasant month, with an average temperature varying between 13.9°C (57°F) and 22.1°C (71.8°F).

Temperature

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

Rainfall

In Lisbon, in May, 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, Portugal, the average water temperature is 17.4°C (63.3°F).
Note: Swimming in 17.4°C (63.3°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

In May, the average length of the day is 14h and 18min.
On the first day of May, sunrise is at 06:38 and sunset at 20:28. On the last day of the month, sunrise is at 06:13 and sunset at 20:54 WEST.

Sunshine

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

UV index

In May, the average daily maximum UV index in Lisbon is 8. A UV Index of 8 to 10 symbolizes a very high health hazard from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 8 in May interpret into the following advice:
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 the 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.
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FAQ

How many days does it rain in May in Lisbon?

In Lisbon, in May, during 8 rainfall days, 53.6mm (2.11") of precipitation is typically accumulated.

How cold is the water in May in Lisbon?

In May, the average sea temperature 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 day length in Lisbon, Portugal, is 14h and 18min.

When is the sunrise / sunset in May in Lisbon?

In May, on the first day of the month, sunrise is at 06:38 and sunset at 20:28. On the last day of the month, in Lisbon, Portugal, sunrise is at 06:13 and sunset at 20:54 WEST.

How long on average sun shines in May in Lisbon?

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

How high is the UV index 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 vulnerability from unprotected exposure to UV radiation.

Average temperature in May
Lisbon, Portugal

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).

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Average rainfall in May
Lisbon, Portugal

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).

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Average rainfall days in May
Lisbon, Portugal

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

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

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Average sea temperature in May
Lisbon, Portugal

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).

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Average daylight in May /
Average sunshine in May
Lisbon, Portugal

Average daylight in May / Average sunshine in May - Lisbon, Portugal
  • Average daylight in May: 14h and 18min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 31min).

  • Average sunshine in May: 9h

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

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Average UV index in May
Lisbon, Portugal

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

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

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