Dehiwala
Sri Lanka
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Dehiwala, Sri Lanka

The first month of the winter, December, is still a hot month in Dehiwala, Sri Lanka, with average temperature ranging between min 22°C (71.6°F) and max 30°C (86°F).

Temperature

The coldest months are June through December, with an average high-temperature of 30°C (86°F).

Rainfall

In Dehiwala, during December, the rain falls for 10 days and regularly aggregates up to 166mm (6.5") of precipitation. In Dehiwala, Sri Lanka, during the entire year, the rain falls for 139 days and collects up to 2402mm (94.6") of precipitation.

Sea temperature

In Dehiwala, 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.

Daylight

With an average of 11.7h of daylight, December has the shortest days of the year in Dehiwala.

Sunshine

In Dehiwala, the average sunshine in December is 7h.

UV index

Months with the lowest UV index are January, November and December, with an average maximum UV index of 11. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV radiation for average individuals.
In December, the average maximum UV index of 11 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 coldest month in Dehiwala?

June through December, with an average high-temperature of 30°C (86°F), are the coldest months.

What is the temperature in December in Dehiwala?

In Dehiwala, Sri Lanka, in December, the average high-temperature is 30°C (86°F), and the average low-temperature is 22°C (71.6°F).

How much does it rain in Dehiwala in December?

In Dehiwala, Sri Lanka, in December, it is raining for 10 days, with typically 166mm (6.5") of accumulated precipitation.

What is the sea water temperature in December in Dehiwala?

In Dehiwala, the average seawater temperature in December 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 Dehiwala?

With an average of 11.7h of daylight, December has the shortest days of the year in Dehiwala, Sri Lanka.

How many hours of daylight does Dehiwala have in December?

In Dehiwala, the average length of the day in December is 11.7h.

How many hours of sunshine does Dehiwala have in December?

In Dehiwala, Sri Lanka, the average sunshine in December is 7h.

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

January, November and December, with an average maximum UV index of 11, are months with the lowest UV index.

How high is the UV index in December in Dehiwala?

In Dehiwala, Sri Lanka, the average daily maximum UV index in December is 11. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in December - Dehiwala, Sri Lanka
  • Average high temperature in December: 30°C

Warmest months (with the highest average high temperature) are March and April (32°C).
Months with the lowest average high temperature are June, July, August, September, October, November and December (30°C).

  • Average low temperature in December: 22°C

Months with the highest average low temperature are May, June, July, August and September (25°C).
Coldest months (with the lowest average low temperature) are January and December (22°C).

Average rainfall in December - Dehiwala, Sri Lanka
  • Average rainfall in December: 166mm

The wettest month (with the highest rainfall) is May (382mm).
The driest month (with the lowest rainfall) is January (55mm).

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

The month with the highest number of rainy days is October (16 days).
Months with the lowest number of rainy days are January and February (5 days).

Average sea temperature in December - Dehiwala, 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 - Dehiwala, 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

Months with most sunshine are February and March (Average sunshine: 9h).
Months with least sunshine are May, June, July, August, September and October (Average sunshine: 6).

Average UV index in December - Dehiwala, 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).