Sri Lanka weather in December
Sri Lanka averages 29°C by day and 23°C at night in December, with the sea at 29°C and 22 days with at least 1 mm of rain.
Day
29°C
Night
23°C
Sea
29°C
Rainy days
22
Flight from London
11h
What December feels like
December is hot but wet in Sri Lanka: rainy season, so pack for showers.
The sea is warm at 29°C: comfortable for long swims.
It is rainy season, with rain on about 22 days.
Of the 48 sun destinations we track, Sri Lanka is the #11 warmest in December.
Want it warmer in December?
These are hotter than Sri Lanka this month for at most an hour and a half more flying:
Sri Lanka weather by month
December is highlighted. Compare with November and January, or see the full year in Sri Lanka.
Sri Lanka in December: quick answers
Is Sri Lanka hot in December?
December is hot but wet in Sri Lanka: rainy season, so pack for showers. Average highs are 29°C and lows 23°C.
Can you swim in Sri Lanka in December?
The sea is warm at 29°C: comfortable for long swims.
Does it rain in Sri Lanka in December?
It is rainy season, with rain on about 22 days.
What is the warmest month in Sri Lanka?
March, at an average high of 31°C. The coolest is August at 28°C.
How long is the flight to Sri Lanka from the UK?
About 11h direct from London, estimated from the 8,838 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 for south coast, 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 Sri Lanka in December?
Save the restaurants, beaches and views you find on TikTok and Instagram for Sri Lanka straight to a map, then let Dream Trip turn them into a day-by-day plan.
