Chennai
India
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Chennai, India

A staircase to the front entrance of the Ramakrishna Temple in Chennai, India
A staircase to the front entrance of the Ramakrishna Temple in Chennai, India
The first month of the winter, December, is still a warm month in Chennai, India, with temperature in the range of an average low of 21.9°C (71.4°F) and an average high of 28.5°C (83.3°F).

Temperature

December is the coldest month, with an average high-temperature of 28.5°C (83.3°F) and an average low-temperature of 21.9°C (71.4°F).

Heat index

In December, the average heat index is calculated to a tropical 32.8°C (91°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, metabolic differences), and activity. 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In December, the average relative humidity in Chennai is 77%.

Rainfall

In Chennai, in December, during 6.3 rainfall days, 191.1mm (7.5") of precipitation is typically accumulated. In Chennai, during the entire year, the rain falls for 59.1 days and collects up to 1391.5mm (54.8") of precipitation.

Sea temperature

In December, the average sea temperature in Chennai is 26.9°C (80.4°F).
Note: 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.

Daylight

December has the shortest days of the year in Chennai, with an average of 11.4h of daylight.

Sunshine

In Chennai, the average sunshine in December is 6.6h.

UV index

With an average maximum UV index of 9, December is the month with the lowest UV index in Chennai. A UV Index reading of 8 to 10 represents a very high health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 9 interpret into the following advice:
Take special precautions, as unprotected skin can be damaged and can burn quickly. 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Chennai?

December is the coldest month, with an average high-temperature of 28.5°C (83.3°F) and an average low-temperature of 21.9°C (71.4°F).

What is the temperature in December in Chennai?

In Chennai, in December, the average high-temperature is 28.5°C (83.3°F), and the average low-temperature is 21.9°C (71.4°F). In December, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is evaluated at 32.8°C (91°F).

What is the average humidity in December in Chennai?

In Chennai, India, the average relative humidity in December is 77%.

How many days does it rain in December in Chennai?

In Chennai, India, in December, it is raining for 6.3 days, with typically 191.1mm (7.5") of accumulated precipitation.

What is the water temperature in December in Chennai?

In Chennai, the average seawater temperature in December is 26.9°C (80.4°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.

What is the month with the shortest days in Chennai?

The month with the shortest days is December, with an average of 11.4h of daylight.

How many hours of daylight does Chennai have in December?

The average length of the day in December in Chennai is 11.4h.

How many hours of sunshine does Chennai have in December?

The average sunshine in December in Chennai is 6.6h.

What is the month with the lowest UV index in Chennai?

December is the month with the lowest UV index, with an average maximum UV index of 9.

How high is the UV index in December in Chennai?

The average daily maximum UV index in December in Chennai, India, is 9. A UV Index estimate of 8 to 10 represents a very high health risk from the exposure to the Sun's UV radiation.
Average temperature in December - Chennai, India
  • Average high temperature in December: 28.5°C

The warmest month (with the highest average high temperature) is June (36.9°C).
The month with the lowest average high temperature is December (28.5°C).

  • Average low temperature in December: 21.9°C

The month with the highest average low temperature is May (27.9°C).
The coldest month (with the lowest average low temperature) is January (20.9°C).

Average humidity in December - Chennai, India
  • Average humidity in December: 77%

The month with the highest relative humidity is November (78%).
The month with the lowest relative humidity is June (57%).

Average rainfall in December - Chennai, India
  • Average rainfall in December: 191.1mm

The wettest month (with the highest rainfall) is November (407.4mm).
The driest month (with the lowest rainfall) is February (2.2mm).

Average rainfall days in December - Chennai, India
  • Average rainfall days in December: 6.3 days

The month with the highest number of rainy days is November (11.7 days).
The month with the lowest number of rainy days is March (0.3 days).

Average sea temperature in December - Chennai, India
  • Average sea temperature in December: 26.9°C

The best month for swimming (with the highest average sea temperature) is May (29.5°C).
The coldest month (with the lowest average sea temperature) is January (26.8°C).

Average daylight in December / Average sunshine in December - Chennai, India
  • Average daylight in December: 11.4h

The month with the longest days is June (Average daylight: 12.9h).
The month with shortest days is December (Average daylight: 11.4h).

  • Average sunshine in December: 6.6h

The month with most sunshine is April (Average sunshine: 9.7h).
The month with least sunshine is July (Average sunshine: 6h).

Average UV index in December - Chennai, India
  • Average UV index in December: 9

Months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).