Long-term weather forecast
Long-term weather forecast

December 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
Winter kicks in December. Temperatures drop to 54°F (12.2°C) and most days are overcast and rainy. Appropriate use of this time would be to explore the beauty and tranquillity that Lisbon's indoor tourist attraction sites have to offer.
December is a great time to go and uncover the awe-inspiring mummies and gothic relics in the Carmo Archaeological Museum. Art lovers could also visit the National Museum of Contemporary Art and experience the beauty of unique, priceless sculptures and paintings.
  • The average high temperature in December: 15.3°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 December: 9.4°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 December: 126.7mm

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 December: 14 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 December: 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 December: 10h

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 December: 5h

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 December: 2

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).