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

October 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 post monsoon autumn, October, is still a hot month in Chennai, India, with temperature in the range of an average high of 31.8°C (89.2°F) and an average low of 24.5°C (76.1°F).

Temperature

In October, the average high-temperature is practically the same as in September - a still hot 31.8°C (89.2°F). In Chennai, in October, the average low-temperature is 24.5°C (76.1°F).

Heat index

The average heat index is calculated to a scorching 42.4°C (108.3°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, wind, metabolic differences). 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. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in Chennai is 77%.

Rainfall

In Chennai, India, during October, the rain falls for 10.6 days and regularly aggregates up to 278.8mm (11") of precipitation. 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 October, the average sea temperature is 29.3°C (84.7°F).
Note: 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

The average length of the day in October is 11.8h.

Sunshine

The average sunshine in Chennai is 6.3h.

UV index

In Chennai, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an extreme threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In October, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. 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. 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 temperature in October in Chennai?

In Chennai, in October, the average high-temperature is 31.8°C (89.2°F), and the average low-temperature is 24.5°C (76.1°F). In October, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that calculates temperature value influenced by the moisture in the air, is evaluated at 42.4°C (108.3°F).

What is the average humidity in October in Chennai?

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

How much does it rain in Chennai in October?

In Chennai, India, in October, it is raining for 10.6 days, with typically 278.8mm (11") of accumulated precipitation.

How warm is the water in October in Chennai?

In Chennai, India, in October, the average water temperature is 29.3°C (84.7°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.

How many hours of daylight does Chennai have in October?

The average length of the day in October in Chennai is 11.8h.

How long on average sun shines in October in Chennai?

The average sunshine in October in Chennai, India, is 6.3h.

How high is the UV index in October in Chennai?

In Chennai, the average daily maximum UV index in October is 11. A UV Index reading of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in October - Chennai, India
  • Average high temperature in October: 31.8°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 October: 24.5°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 October - Chennai, India
  • Average humidity in October: 77%

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

Average rainfall in October - Chennai, India
  • Average rainfall in October: 278.8mm

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 October - Chennai, India
  • Average rainfall days in October: 10.6 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 October - Chennai, India
  • Average sea temperature in October: 29.3°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 October / Average sunshine in October - Chennai, India
  • Average daylight in October: 11.8h

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 October: 6.3h

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 October - Chennai, India
  • Average UV index in October: 11

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).