Colombo Weather in December
Sri Lanka · Tropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Colombo sees average temperatures ranging from a low of 23.1°C (73.6°F) to a high of 29.5°C (85.1°F), with a mean of 25.9°C (78.6°F). Compared to the annual average of 26.7°C (80.1°F), this month is 0.8°C cooler than the yearly norm. Precipitation averages 198.0mm, making it approximately 51.0mm drier than the monthly average of 249.0mm. The city receives an average of 8.9 hours of sunshine per day during December, with relative humidity averaging 84.5%. Wind speeds reach an average maximum of 15.0 km/h. For travelers, this month offers a temperature experience in Colombo, with drier-than-average conditions compared to the rest of the year.
Colombo's tropical climate is warm and humid year-round, with two monsoon seasons. I've tracked the rainfall patterns and found that the city receives most of its rain from May to August and October to January. The best time for visiting is January to April, when the weather is drier and the coastal attractions are most enjoyable.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 25.7°C (78.3°F) | 25.9°C (78.6°F) | 25.9°C (78.6°F) |
| Rainfall | 410.7mm | 198.0mm | 119.8mm |
| Sunshine | 7.5 hrs | 8.9 hrs | 10.0 hrs |
| Humidity | 87.8% | 84.5% | 80.8% |
| Wind | 14.4 km/h | 15.0 km/h | 15.4 km/h |
| Rainy Days | 28.6 | 25.8 | 20.4 |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Colombo in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Colombo in December?
The average temperature in Colombo during December ranges from 23.1°C (73.6°F) to 29.5°C (85.1°F), with a mean of 25.9°C (78.6°F).
How much does it rain in Colombo in December?
Colombo receives an average of 198.0mm of precipitation in December, spread across approximately 25.8 rainy days.
What should I pack for Colombo in December?
Based on December weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 198.0mm of precipitation.
Is December a good time to visit Colombo?
December is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Colombo
Cities with Similar December Climate (Tropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 6.93°, 79.85°. Timezone: Asia/Colombo. Last updated: 2026-07-30.