December weather forecast
Moratuwa, Sri Lanka

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Weather in December

Rounding off the year, December brings a significant change in the weather of Moratuwa. It marks the dawn of the dry season, with less rainfall and reduced humidity levels. The sea temperature decreases further, inviting for various maritime activities. The month records the least rainfall of the year with 93mm (3.66"), setting a dry tone for the upcoming year. Wind speeds in December rise slightly, leading to gentle whispering breezes across the city.

Temperature

Welcoming December, Moratuwa notes an average high-temperature of a still warm 29.7°C (85.5°F), nearly consistent with November's 29.8°C (85.6°F). The average low-temperature in Moratuwa during December nights is a still warm 24.4°C (75.9°F).

Heat index

The heat index for December is appraised at a very hot 36°C (96.8°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

In Moratuwa, the average relative humidity in December is 79%.

Rainfall

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

Sea temperature

In Moratuwa, Sri Lanka, the average seawater temperature in December 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 in Moratuwa, with an average of 11h and 42min of daylight.
On the first day of December in Moratuwa, sunrise is at 06:06 and sunset at 17:52. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.

Sunshine

The average sunshine in December in Moratuwa 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. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 7 in December interprets into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Caution! The Sun's UV intensity grows with reflections off sand and water.

Frequently asked questions

How hot does it get in Moratuwa in December?

In December, in Moratuwa, 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. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in December is appraised at 36°C (96.8°F).

What is the average humidity in December in Moratuwa?

In Moratuwa, the average relative humidity in December is 79%.

How much does it rain in Moratuwa in December?

In Moratuwa, Sri Lanka, during December, the rain falls for 16.5 days and regularly aggregates up to 93mm (3.66") of precipitation.

What is the sea water temperature in December in Moratuwa?

In December, the average sea temperature 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 Moratuwa?

With an average of 11h and 42min of daylight, December has the shortest days of the year in Moratuwa.

How many hours of daylight does Moratuwa have in December?

The average day length in December in Moratuwa, Sri Lanka, is 11h and 44min.

When are sunrise and sunset in December in Moratuwa?

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

How many hours of sunshine does Moratuwa have in December?

In December, the average sunshine duration in Moratuwa is 7.1h.

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

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

How high is the UV index in December in Moratuwa?

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

Average temperature in December
Moratuwa, Sri Lanka

Average temperature in December - Moratuwa, 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).

Average pressure in December
Moratuwa, Sri Lanka

Average pressure in December - Moratuwa, 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).

Average wind speed in December
Moratuwa, Sri Lanka

Average wind speed in December - Moratuwa, 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).

Average humidity in December
Moratuwa, Sri Lanka

Average humidity in December - Moratuwa, 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%).

Average rainfall in December
Moratuwa, Sri Lanka

Average rainfall in December - Moratuwa, 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).

Average rainfall days in December
Moratuwa, Sri Lanka

Average rainfall days in December - Moratuwa, 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).

Average sea temperature in December
Moratuwa, Sri Lanka

Average sea temperature in December - Moratuwa, 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
Moratuwa, Sri Lanka

Average daylight in December / Average sunshine in December - Moratuwa, 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: 7h and 1min

The month with the most sunshine is January (Average sunshine: 9h and 12min).
The month with the least sunshine is November (Average sunshine: 6h and 48min).

Average sunshine days in December
Moratuwa, Sri Lanka

Average sunshine days in December - Moratuwa, 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).

Average UV index in December
Moratuwa, Sri Lanka

Average UV index in December - Moratuwa, 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).

Average cloud cover in December
Moratuwa, Sri Lanka

Average cloud cover in December - Moratuwa, 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).

Average visibility in December
Moratuwa, Sri Lanka

Average visibility in December - Moratuwa, 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).

Moratuwa, Sri Lanka

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