December 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 December

The first month of the winter, December, is still a mild month in Lisbon, Portugal, with temperature in the range of an average low of 9.4°C (48.9°F) and an average high of 15.3°C (59.5°F).

Temperature

In Lisbon, the average high-temperature is essentially the same as in November - a moderate 15.3°C (59.5°F). The average low-temperature, in Lisbon, is 9.4°C (48.9°F).

Rainfall

In December, the rain falls for 14 days. Throughout December, 126.7mm (4.99") of precipitation is accumulated. Throughout the year, there are 112 rainfall days, and 774mm (30.47") of precipitation is accumulated.

Sea temperature

In Lisbon, Portugal, the average seawater temperature in December is 16.6°C (61.9°F).
Note: For most, swimming in 16.6°C (61.9°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

The month with the shortest days is December, with an average of 9.5h of daylight.

Sunshine

Months with the least sunshine in Lisbon are January, February, November and December, with an average of 5h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Lisbon. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

How much does it rain in Lisbon in December?

In Lisbon, Portugal, in December, it is raining for 14 days, with typically 126.7mm (4.99") of accumulated precipitation.

What is the sea temperature in December in Lisbon?

In December, the average sea temperature in Lisbon, Portugal, is 16.6°C (61.9°F). For swimming, a surface water temperature of 16.6°C (61.9°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 month with the shortest days in Lisbon?

December has the shortest days of the year in Lisbon, with an average of 9.5h of daylight.

How many hours of daylight does Lisbon have in December?

In Lisbon, Portugal, the average length of the day in December is 9.5h.

What is the month with the least sunshine in Lisbon?

Months with the least sunshine in Lisbon, Portugal, are January, February, November and December, with an average of 5h of sunshine.

How long on average sun shines in December in Lisbon?

In Lisbon, Portugal, the average sunshine in December is 5h.

What are the months with the lowest UV index in Lisbon?

Months with the lowest UV index in Lisbon are January and December, with an average maximum UV index of 2.

How high is the UV index in December in Lisbon?

In December, the average daily maximum UV index in Lisbon, Portugal, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Lisbon, Portugal

Average temperature in December - Lisbon, Portugal
  • 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).

  • 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).

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Average rainfall in December
Lisbon, Portugal

Average rainfall in December - Lisbon, Portugal
  • Average rainfall in December: 126.7mm

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 December
Lisbon, Portugal

Average rainfall days in December - Lisbon, Portugal
  • 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 least rainy days are July and August (2 days).

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Average sea temperature in December
Lisbon, Portugal

Average sea temperature in December - Lisbon, Portugal
  • Average sea temperature in December: 16.6°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 December /
Average sunshine in December
Lisbon, Portugal

Average daylight in December / Average sunshine in December - Lisbon, Portugal
  • Average daylight in December: 9.5h

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 December: 5h

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).

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Average UV index in December
Lisbon, Portugal

Average UV index in December - Lisbon, Portugal
  • 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).

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