December weather forecast
Colombo, Sri Lanka

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Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake

Weather in December

Closing the year, December in Colombo features the most significant decrease in rainfall to 148mm (5.83"). The relative humidity matches November levels, keeping the moisture in the air fairly consistent. The wind picks up just slightly, providing a comfortable, gentle breeze. Daylight hours slightly recede to match January’s level. The city's festive atmosphere, combined with comfortable weather conditions, makes this a delightful month to conclude the year in Colombo.

Temperature

Colombo's average high-temperature in December is a moderately hot 29.9°C (85.8°F), marking an insignificant difference from the 30.1°C (86.2°F) of November. During December, Colombo experiences an average low-temperature of 23.7°C (74.7°F) at night.

Heat index

For December, the heat index is computed to be a very hot 37°C (98.6°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
In terms of the heat index, values are set with light wind and shade conditions in mind. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Colombo, in December, it is raining for 21.1 days, with typically 148mm (5.83") of accumulated precipitation. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

In Colombo, in December, the average water temperature is 28.1°C (82.6°F).
Note: For swimming, diving, or other water activities, temperatures from 25°C (77°F) to 29°C (84.2°F) provide the most enjoyable experience for extended periods without discomfort.

Daylight

December has the shortest days of the year, with an average of 11h and 42min of daylight.
On the first day of December, sunrise is at 06:07 and sunset at 17:52. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

In Colombo, the average sunshine in December is 6.9h.

UV index

The months with the highest UV index in Colombo are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 7 in December converts into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Boost your sun resistance with garments that are densely woven yet spacious. Warning! Sand and water reflections boost the intensity of UV exposure.
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Frequently asked questions

How hot is it in Colombo in December?

The average high-temperature and low-temperature during December are 29.9°C (85.8°F) and 23.7°C (74.7°F) respectively. In December, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 37°C (98.6°F).

What is the average humidity in December in Colombo?

In December, the average relative humidity in Colombo, Sri Lanka, is 79%.

How many days does it rain in December in Colombo?

In Colombo, during December, the rain falls for 21.1 days and regularly aggregates up to 148mm (5.83") of precipitation.

What is the water temperature in December in Colombo?

In Colombo, the average seawater temperature in December is 28.1°C (82.6°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the month with the shortest days in Colombo?

December has the shortest days of the year in Colombo, Sri Lanka, with an average of 11h and 42min of daylight.

How many hours of daylight does Colombo have in December?

In Colombo, the average day length in December is 11h and 44min.

When is the sunrise / sunset in December in Colombo?

In December, on the first day of the month, sunrise is at 06:07 and sunset at 17:52. On the last day of the month, in Colombo, sunrise is at 06:21 and sunset at 18:05 +0530.

How many hours of sunshine does Colombo have in December?

In December, the average sunshine duration in Colombo is 6.9h.

What are the months with the highest UV index in Colombo?

January through April, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index intensity in December in Colombo?

In Colombo, Sri Lanka, the average daily maximum UV index in December is 7. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to Sun's UV rays.

Average temperature in December
Colombo, Sri Lanka

Average temperature in December - Colombo, Sri Lanka
  • Average high temperature in December: 29.9°C

The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°C).

  • Average low temperature in December: 23.7°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.1°C).

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Average pressure in December
Colombo, Sri Lanka

Average pressure in December - Colombo, Sri Lanka
  • Average pressure in December: 1010.4mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

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Average wind speed in December
Colombo, Sri Lanka

Average wind speed in December - Colombo, Sri Lanka
  • Average wind speed in December: 11.5km/h

The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).

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Average humidity in December
Colombo, Sri Lanka

Average humidity in December - Colombo, Sri Lanka
  • Average humidity in December: 79%

The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (74%).

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Average rainfall in December
Colombo, Sri Lanka

Average rainfall in December - Colombo, Sri Lanka
  • Average rainfall in December: 148mm

The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).

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Average rainfall days in December
Colombo, Sri Lanka

Average rainfall days in December - Colombo, Sri Lanka
  • Average rainfall days in December: 21.1 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).

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Average sea temperature in December
Colombo, Sri Lanka

Average sea temperature in December - Colombo, Sri Lanka
  • Average sea temperature in December: 28.1°C

The best month for swimming (with the highest average sea temperature) is April (29.6°C).
The coldest month (with the lowest average sea temperature) is August (27.2°C).

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Average daylight in December /
Average sunshine in December
Colombo, Sri Lanka

Average daylight in December / Average sunshine in December - Colombo, Sri Lanka
  • Average daylight in December: 11h and 4min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in December: 6h and 5min

The month with the most sunshine is January (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

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Average sunshine days in December
Colombo, Sri Lanka

Average sunshine days in December - Colombo, Sri Lanka
  • Average sunshine days in December: 8.3 days

The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).

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Average UV index in December
Colombo, Sri Lanka

Average UV index in December - Colombo, Sri Lanka
  • Average UV index in December: 7

The months with the highest UV index are January, February, March, April, July, September, November and December (UV index 7).
The months with the lowest UV index are May, June, August and October (UV index 6).

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Average cloud cover in December
Colombo, Sri Lanka

Average cloud cover in December - Colombo, Sri Lanka
  • Average cloud cover in December: 38

The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in December
Colombo, Sri Lanka

Average visibility in December - Colombo, Sri Lanka
  • Average visibility in December: 10km

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).

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Colombo, Sri Lanka

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