Colombo weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Fair
Best time to visit: January – February
What is the weather like in Colombo in December?
In December, Colombo is hot: daytime highs average 29 °C, and even at night it stays warm at around 23 °C. The sea averages 28.3 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 17 days, totalling 183 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a so-so month for a holiday in Colombo.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 45 | 49 | 64 |
| Day | 29° | 29° | 30° |
| Night | 24° | 23° | 23° |
| Sea | 29° | 28° | 28° |
| Sun | 5 h | 6 h | 8 h |
| Rain days | 24 | 17 | 9 |
More details for December
- Daylight
- 11 h 43 min06:14 – 17:57
- UV index
- 10 · very highclear sky, noon (estimate)
- Muggy days
- 31 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 69 %on average
- Hot days
- 8 days30 °C or more
- Time zone
- UTC+5:30Asia/Colombo
How the score comes together
- Temperatureweight 50 %73 %
- Sunshineweight 20 %53 %
- Few rainy daysweight 30 %8 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Colombo in December: quick answers
Is Colombo hot in December?
Yes. In December, Colombo is hot: daytime highs average 29 °C and nights stay around 23 °C. On about 8 days the thermometer climbs to 30 °C or more.
Can you swim in Colombo in December?
Yes. In December the sea averages 28.3 °C – lovely and warm for swimming.
Does it rain much in Colombo in December?
It rains often – on about 17 days, adding up to 183 mm.
Colombo month by month
The whole year in ColomboAll destinations: Sri Lanka
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)