December weather forecast
Lisbon, Portugal

During December, Lisbon finally succumbs to winter, with temperatures hitting near-year lows at around 15.3°C (59.5°F). Despite experiencing substantial rainfall at 127mm (5"), Lisbon retains its charm, morphing into a winter wonderland under the Mediterranean sun. The days are at their shortest, with daylight hours dropping to a mere 9.5 hours, signaling the onset of winter festivities. With the lowest sea temperatures of the year, beach activities come to a standstill, shifting the focus to shopping, indoor entertainment, and holiday events.

Temperature

The onset of December in Lisbon manifests an average high-temperature of a moderate 15.3°C (59.5°F), demonstrating a minor variation from the preceding month. During December, the average low-temperature is a chilly 9.4°C (48.9°F).

Rainfall

In Lisbon, Portugal, during December, the rain falls for 14 days and regularly aggregates up to 127mm (5") of precipitation. In Lisbon, during the entire year, the rain falls for 112 days and collects up to 774mm (30.47") of precipitation.

Sea temperature

In Lisbon, the average seawater temperature in December is 16.6°C (61.9°F).
Note: Swimming becomes less enjoyable for most at a surface water temperature of 16.6°C (61.9°F). As the temperature decreases below 21°C (69.8°F), breathing becomes increasingly difficult.

Daylight

The month with the shortest days in Lisbon is December, with an average of 9h and 30min of daylight.
On the first day of December in Lisbon, sunrise is at 07:36 and sunset at 17:15. On the last day of the month, sunrise is at 07:54 and sunset at 17:25 WET.

Sunshine

The months with the least sunshine are January, February, November and December, with an average of 5h of sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.