Lisbon weather in December
Lisbon averages 16°C by day and 10°C at night in December, with the sea at 16°C and about 84 mm of rain in the month. That is about 2°C cooler than November.
Day
16°C
Night
10°C
Sea
16°C
Rain
84 mm
Flight from London
2½h
What December feels like
December is mild in Lisbon: good for exploring, not reliably beach weather.
The sea is 16°C: cold for swimming, so plan on a heated pool.
Expect some rainy spells: about 84 mm falls in the month.
That is 7°C warmer than an average December day in London.
Of the 56 sun destinations we track, Lisbon is the #55 warmest in December, and #22 of 23 within 5½ hours of the UK.
Comparing places? See the warmest place in Portugal in winter for every winter month, place by place.
Going to Lisbon in December?
Share the TikToks and Instagram Reels you've saved for Lisbon to Dream Trip. It finds the places, pins them on a map and builds your days around them.
Want it warmer in December?
These are hotter than Lisbon this month for at most an hour and a half more flying:
Lisbon weather by month
December is highlighted. Compare with November and January, or see the full year in Lisbon.
Lisbon in December: quick answers
Is Lisbon hot in December?
December is mild in Lisbon: good for exploring, not reliably beach weather. Average highs are 16°C and lows 10°C.
Can you swim in Lisbon in December?
The sea is 16°C: cold for swimming, so plan on a heated pool.
Does it rain in Lisbon in December?
Expect some rainy spells: about 84 mm falls in the month.
What is the warmest month in Lisbon?
August, at an average high of 29°C. The coolest is January at 15°C.
How long is the flight to Lisbon from the UK?
About 2½h direct from London, estimated from the 1,571 km distance. Check your airline for exact times.
Still choosing? See where is hot in December for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in December from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Lisbon in December?
Save the restaurants, beaches and views you find on TikTok and Instagram for Lisbon straight to a map, then let Dream Trip turn them into a day-by-day plan.
