October weather forecast
Chennai, India

October in Chennai signifies significant climatic transition, hosting a lavish 144mm (5.67") rainfall, the highest in a year. The rain may be relentless, yet it brings a charm to the cityscape that resonates uniquely with this season. The decreasing daylight recommends indoor activities, while the mild temperature ensures comfort throughout the day. Despite the altered wind pattern, the sea's calm and warmth persist, rendering beach visits a delightful affair. To behold Chennai in October is to witness the city find harmony in the cacophony of rain drops and wind whistles.

Temperature

As Chennai steps into October, the average high-temperature is measured at a still tropical 30.9°C (87.6°F), displaying minor differences from September's 31.6°C (88.9°F). Chennai, during October nights, records a temperature marginally cooler than the daytime average, at a moderately hot 26.9°C (80.4°F).

Heat index

The average heat index in October is evaluated at a very hot 38°C (100.4°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Heat index details are generally centered around shaded locations and a mild breeze. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely significant for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. 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. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In October, the average relative humidity in Chennai is 73%.

Rainfall

In Chennai, in October, during 21.5 rainfall days, 144mm (5.67") of precipitation is typically accumulated. Throughout the year, in Chennai, there are 157.6 rainfall days, and 823mm (32.4") of precipitation is accumulated.

Sea temperature

In Chennai, in October, the average water temperature is 29.3°C (84.7°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) provides warmth and pleasure, making water activities enjoyable for lengthened periods without feeling uncomfortable.

Daylight

In October, the average length of the day is 11h and 50min.
On the first day of the month, sunrise is at 5:58 am and sunset at 5:58 pm. On the last day of October, sunrise is at 6:02 am and sunset at 5:42 pm IST.

Sunshine

In October, the average sunshine is 7.9h.

UV index

The month with the lowest UV index is October, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 6 in October suggests the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.