December weather forecast
Bentota, Sri Lanka

Weather in December

The first month of the winter, December, is still a warm month in Bentota, Sri Lanka, with an average temperature varying between 29.7°C (85.5°F) and 24.4°C (75.9°F).

Temperature

In December, the average high-temperature is almost the same as in November - a still moderately hot 29.7°C (85.5°F). In December, the average low-temperature is 24.4°C (75.9°F).

Heat index

The average heat index in December is evaluated at a sweltering 36.5°C (97.7°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like differences in body mass, height, and shape, clothing, pregnancy, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Bentota, during December, the rain falls for 16.5 days and regularly aggregates up to 93mm (3.66") of precipitation. In Bentota, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.

Sea temperature

In Bentota, the average water temperature is 28.1°C (82.6°F).
Note: 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

The month with the shortest days in Bentota is December, with an average of 11h and 46min of daylight.
On the first day of December, sunrise is at 06:05 and sunset at 17:52. On the last day of the month, sunrise is at 06:20 and sunset at 18:05 +0530.

Sunshine

In Bentota, the average sunshine in December is 7.1h.

UV index

January through April, July, September through December, with an average maximum UV index of 7, are months with the highest UV index in Bentota. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Bentota?

In December, in Bentota, the average high-temperature is 29.7°C (85.5°F), and the average low-temperature is 24.4°C (75.9°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in December is evaluated at 36.5°C (97.7°F).

What is the average humidity in December in Bentota?

The average relative humidity in December is 79%.

How much does it rain in Bentota in December?

In December, in Bentota, the rain falls for 16.5 days. Throughout December, 93mm (3.66") of precipitation is accumulated.

What is the sea water temperature in December in Bentota?

In Bentota, the average seawater temperature in December is 28.1°C (82.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Bentota?

The month with the shortest days in Bentota is December, with an average of 11h and 46min of daylight.

How many hours of daylight does Bentota have in December?

The average day length in December is 11h and 46min.

When are sunrise and sunset in December in Bentota?

On the first day of December in Bentota, sunrise is at 06:05 and sunset at 17:52. On the last day of the month, sunrise is at 06:20 and sunset at 18:05 +0530.

How many hours of sunshine does Bentota have in December?

The average sunshine duration in December in Bentota is 7.1h.

What is the month with the highest UV index in Bentota?

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

How high is the UV index in December in Bentota?

In Bentota, the average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in December
Bentota, Sri Lanka

Average temperature in December - Bentota, Sri Lanka
  • Average high temperature in December: 29.7°C

The warmest months (with the highest average high temperature) are March and April (31.3°C).
The month with the lowest average high temperature is August (28.6°C).

  • Average low temperature in December: 24.4°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 (23.4°C).

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Average pressure in December
Bentota, Sri Lanka

Average pressure in December - Bentota, 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 (1008.7mbar).

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Average wind speed in December
Bentota, Sri Lanka

Average wind speed in December - Bentota, Sri Lanka
  • Average wind speed in December: 11.3km/h

The windiest month (with the highest average wind speed) is June (15.9km/h).
The calmest month (with the lowest average wind speed) is March (7.9km/h).

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Average humidity in December
Bentota, Sri Lanka

Average humidity in December - Bentota, 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 (75%).

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Average rainfall in December
Bentota, Sri Lanka

Average rainfall in December - Bentota, Sri Lanka
  • Average rainfall in December: 93mm

The wettest month (with the highest rainfall) is June (350mm).
The driest month (with the least rainfall) is January (25mm).

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Average rainfall days in December
Bentota, Sri Lanka

Average rainfall days in December - Bentota, Sri Lanka
  • Average rainfall days in December: 16.5 days

The months with the highest number of rainy days are July and August (29.5 days).
The month with the least rainy days is January (8.9 days).

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Average sea temperature in December
Bentota, Sri Lanka

Average sea temperature in December - Bentota, 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 July (27.3°C).

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

Average daylight in December / Average sunshine in December - Bentota, Sri Lanka
  • Average daylight in December: 11h and 46min

The month with the longest days is June (Average daylight: 12h and 29min).
The month with the shortest days is December (Average daylight: 11h and 46min).

  • Average sunshine in December: 7.1h

The month with the most sunshine is January (Average sunshine: 9.2h).
The month with the least sunshine is November (Average sunshine: 6.8h).

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Average sunshine days in December
Bentota, Sri Lanka

Average sunshine days in December - Bentota, Sri Lanka
  • Average sunshine days in December: 12.5 days

The month with the most sunshine days is January (21 days).
The months with the least sunshine days are June and July (0.3 days).

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Average UV index in December
Bentota, Sri Lanka

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

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

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Average cloud cover in December
Bentota, Sri Lanka

Average cloud cover in December - Bentota, Sri Lanka
  • Average cloud cover in December: 37

The month with the most cloud cover is June (Cloud cover 55).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in December
Bentota, Sri Lanka

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

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

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