Colombo
Sri Lanka
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Colombo, Sri Lanka

Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake, and a view of the tall buildings of Colombo
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake, and a view of the tall buildings of Colombo
The first month of the winter, Diciembre, is also a hot month in Colombo, Sri Lanka, with average temperature varying between 30.3°C (86.5°F) and 22.8°C (73°F).

Temperature

In Colombo, the average high-temperature in Diciembre is practically the same as in Noviembre - a still hot 30.3°C (86.5°F). In Diciembre, in Colombo, the average low-temperature is 22.8°C (73°F).

Heat index

In Diciembre, the average heat index is appraised at a very hot 36.6°C (97.9°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like clothing, wind, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Diciembre, the average relative humidity is 73%.

Rainfall

In Diciembre, the rain falls for 10 days. Throughout Diciembre, 175.3mm (6.9") of precipitation is accumulated. In Colombo, during the entire year, the rain falls for 145 days and collects up to 2523.7mm (99.36") of precipitation.

Sea temperature

In Diciembre, the average sea temperature in Colombo is 28.1°C (82.6°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

With an average of 11.7h of daylight, Diciembre has the shortest days of the year in Colombo.

Sunshine

The average sunshine in Colombo is 7h.

UV index

Enero, Noviembre and Diciembre, with an average maximum UV index of 11, are months with the lowest UV index in Colombo, Sri Lanka. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In Diciembre, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in Diciembre in Colombo?

In Colombo, Sri Lanka, in Diciembre, the average high-temperature is 30.3°C (86.5°F), and the average low-temperature is 22.8°C (73°F). In Diciembre, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is evaluated at 36.6°C (97.9°F).

What is the average humidity in Diciembre in Colombo?

In Colombo, the average relative humidity in Diciembre is 73%.

How many days does it rain in Diciembre in Colombo?

In Colombo, Sri Lanka, in Diciembre, it is raining for 10 days, with typically 175.3mm (6.9") of accumulated precipitation.

What is the water temperature in Diciembre in Colombo?

In Diciembre, the average sea temperature in Colombo is 28.1°C (82.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Colombo?

With an average of 11.7h of daylight, Diciembre has the shortest days of the year.

What is the average length of the day in Diciembre in Colombo?

In Colombo, Sri Lanka, the average length of the day in Diciembre is 11.7h.

How long on average sun shines in Diciembre in Colombo?

In Diciembre, the average sunshine in Colombo is 7h.

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

Enero, Noviembre and Diciembre, with an average maximum UV index of 11, are months with the lowest UV index.

How high is the UV index in Diciembre in Colombo?

In Colombo, Sri Lanka, the average daily maximum UV index in Diciembre is 11. A UV Index reading of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in December - Colombo, Sri Lanka
  • Average high temperature in December: 30.3°C

The warmest month (with the highest average high temperature) is April (31.8°C).
Months with the lowest average high temperature are July, August and October (30°C).

  • Average low temperature in December: 22.8°C

Months with the highest average low temperature are May and June (25.5°C).
The coldest month (with the lowest average low temperature) is January (22.3°C).

Average humidity in December - Colombo, Sri Lanka
  • Average humidity in December: 73%

The month with the highest relative humidity is June (79%).
Months with the lowest relative humidity are January and February (69%).

Average rainfall in December - Colombo, Sri Lanka
  • Average rainfall in December: 175.3mm

The wettest month (with the highest rainfall) is November (414.4mm).
The driest month (with the lowest rainfall) is January (58.2mm).

Average rainfall days in December - Colombo, Sri Lanka
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is October (17 days).
Months with the lowest number of rainy days are January and February (5 days).

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).

Average daylight in December / Average sunshine in December - Colombo, Sri Lanka
  • Average daylight in December: 11.7h

Months with the longest days are June and July (Average daylight: 12.5h).
The month with shortest days is December (Average daylight: 11.7h).

  • Average sunshine in December: 7h

The month with most sunshine is March (Average sunshine: 8.9h).
The month with least sunshine is September (Average sunshine: 6.3h).

Average UV index in December - Colombo, Sri Lanka
  • Average UV index in December: 11

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
Months with the lowest UV index are January, November and December (UV index 11).