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, seen on a sunny day
The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle, seen on a sunny day
Lisbon is fairly warm in May, with an average temperature of 65°F (18.3°C). The Bars along 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.
  • The 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).

  • The 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).

  • The 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).

  • The 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).

  • The average sea temperature in May: 17°C

Best months for swimming (with the highest average sea temperature) are August and September (20°C).
Coldest months (with the lowest average sea temperature) are January, February and March (15°C).

  • The average daylight in May: 14h

Months with the longest days are June and July (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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).

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