Mirissa
Sri Lanka
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Mirissa, Sri Lanka

A row of palm trees with boats under, along Tropical Beach in Mirissa, Sri Lanka, with a sneak view of water approaching the beautiful brown sandy shore
A row of palm trees with boats under, along Tropical Beach in Mirissa, Sri Lanka, with a sneak view of water approaching the beautiful brown sandy shore
December, the first month of the winter, in Mirissa, is still a warm month, with temperature in the range of an average high of 29°C (84.2°F) and an average low of 23°C (73.4°F).

Temperature

The coldest months are August through October and December, with an average high-temperature of 29°C (84.2°F).

Rainfall

In Mirissa, during December, the rain falls for 10 days and regularly aggregates up to 171mm (6.7") of precipitation. Throughout the year, in Mirissa, Sri Lanka, there are 116 rainfall days, and 2216mm (87.2") of precipitation is accumulated.

Sea temperature

January, February, June through October and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater. 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

Months with the shortest days are January and December, with an average of 11.8h of daylight.

Sunshine

Months with the least sunshine are May through December, with an average of 6h of sunshine.

UV index

November and December, with an average maximum UV index of 11, are months with the lowest UV index in Mirissa, Sri Lanka. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV rays for ordinary individuals.
In December, the average maximum UV index of 11 translate into the following recommendations:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Mirissa?

The coldest months in Mirissa, Sri Lanka, are August through October and December, with an average high-temperature of 29°C (84.2°F).

What is the temperature in December in Mirissa?

In Mirissa, in December, the average high-temperature is 29°C (84.2°F), and the average low-temperature is 23°C (73.4°F).

How many days does it rain in December in Mirissa?

In Mirissa, in December, it is raining for 10 days, with typically 171mm (6.7") of accumulated precipitation.

What are the months with the coldest sea water in Mirissa?

January, February, June through October and December, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater in Mirissa, Sri Lanka. 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.

How warm is the water in December in Mirissa?

In December, the average sea temperature in Mirissa, Sri Lanka, is 28°C (82.4°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 Mirissa?

Months with the shortest days in Mirissa, Sri Lanka, are January and December, with an average of 11.8h of daylight.

What is the average length of the day in December in Mirissa?

The average length of the day in December in Mirissa is 11.8h.

What is the month with the least sunshine in Mirissa?

Months with the least sunshine in Mirissa are May through December, with an average of 6h of sunshine.

How long on average sun shines in December in Mirissa?

The average sunshine in December in Mirissa, Sri Lanka, is 6h.

When is the lowest UV index in Mirissa?

Months with the lowest UV index in Mirissa are November and December, with an average maximum UV index of 11.

What is the UV index intensity in December in Mirissa?

In December, the average daily maximum UV index in Mirissa, Sri Lanka, is 11. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Mirissa, Sri Lanka
  • Average high temperature in December: 29°C

Warmest months (with the highest average high temperature) are March and April (31°C).
Months with the lowest average high temperature are August, September, October and December (29°C).

  • Average low temperature in December: 23°C

Months with the highest average low temperature are May and June (25°C).
The coldest month (with the lowest average low temperature) is January (22°C).

Average rainfall in December - Mirissa, Sri Lanka
  • Average rainfall in December: 171mm

The wettest month (with the highest rainfall) is October (305mm).
The driest month (with the lowest rainfall) is January (89mm).

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

The month with the highest number of rainy days is November (14 days).
Months with the lowest number of rainy days are January and February (5 days).

Average sea temperature in December - Mirissa, Sri Lanka
  • Average sea temperature in December: 28°C

The best month for swimming (with the highest average sea temperature) is April (30°C).
Coldest months (with the lowest average sea temperature) are January, February, June, July, August, September, October and December (28°C).

Average daylight in December / Average sunshine in December - Mirissa, Sri Lanka
  • Average daylight in December: 11.8h

The month with the longest days is June (Average daylight: 12.5h).
Months with shortest days are January and December (Average daylight: 11.8h).

  • Average sunshine in December: 6h

Months with most sunshine are February and March (Average sunshine: 8h).
Months with least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6).

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

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