Negombo 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
Good
Best time to visit: January – March
What is the weather like in Negombo in December?
In December, Negombo is hot: daytime highs average 29 °C, and even at night it stays warm at around 24 °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 15 days, totalling 152 mm. On about 7 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a good month for a holiday in Negombo.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 67 | 76 | 92 |
| Day | 29° | 29° | 30° |
| Night | 24° | 24° | 23° |
| Sea | 29° | 28° | 28° |
| Sun | 5 h | 6 h | 8 h |
| Rain days | 23 | 15 | 8 |
More details for December
- Daylight
- 11 h 42 min06:15 – 17:57
- UV index
- 10 · very highclear sky, noon (estimate)
- Muggy days
- 31 daysdew point 18 °C or more
- Wind
- 14 km/haverage daily peak
- Cloud cover
- 68 %on average
- Hot days
- 7 days30 °C or more
- Time zone
- UTC+5:30Asia/Colombo
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %57 %
- Few rainy daysweight 20 %22 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Negombo in December: quick answers
Is Negombo hot in December?
Yes. In December, Negombo is hot: daytime highs average 29 °C and nights stay around 24 °C. On about 7 days the thermometer climbs to 30 °C or more.
Can you swim in Negombo in December?
Yes. In December the sea averages 28.3 °C – lovely and warm for swimming.
Does it rain much in Negombo in December?
It rains often – on about 15 days, adding up to 152 mm.
Negombo month by month
The whole year in NegomboAll 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)