Lisbon weather in December
Lisbon averages 16°C by day and 10°C at night in December, with the sea at 16°C and 9 days with at least 1 mm of rain. That is about 2°C cooler than November.
Day
16°C
Night
10°C
Sea
16°C
Rainy days
9
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 rain: about 9 days with at least 1 mm.
Of the 48 sun destinations we track, Lisbon is the #47 warmest in December, and #22 of 23 within 5½ hours of the UK.
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 rain: about 9 days with at least 1 mm.
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. A rainy day has at least 1 mm of rain. 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?
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