July weather forecast
Chennai, India

Journeying with full force into monsoon, July in Chennai is saturated with 67mm (2.64") rain, making way for a more refreshing climate. As the sun dips from its zenith, the temperature starts to ease, indirectly amplifying the effects of each rain shower. Cloud presence intensifies, functioning as a protective shield against any intense heat. In this cooler, wetter phase, the wind begins to lose strength, surrendering to the dominance of monsoon. The monotonous, intense summer weather of Chennai breaks free with July’s rains, introducing a soothing symphony of breezes and showers.

Temperature

With July's arrival, Chennai's weather records an average high-temperature of a still hot 32.8°C (91°F), marking little difference from June's 34.2°C (93.6°F). Chennai's nighttime temperature in July experiences a slight dip from daytime highs, falling to an average of 28.4°C (83.1°F).

Heat index

The average heat index in July is evaluated at a scorching 41°C (105.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly meaningful for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In July, the average relative humidity in Chennai is 65%.

Rainfall

In Chennai, India, in July, it is raining for 18.6 days, with typically 67mm (2.64") of accumulated precipitation. In Chennai, during the entire year, the rain falls for 157.6 days and collects up to 823mm (32.4") of precipitation.

Sea temperature

In July, the average sea temperature is 29°C (84.2°F).
Note: For any water activity, the surface water temperatures in the range of 25°C (77°F) to 29°C (84.2°F) are deemed excellent and incredibly pleasant for longer durations.

Daylight

The average length of the day in July in Chennai is 12h and 49min.
On the first day of the month, sunrise is at 5:46 am and sunset at 6:39 pm. On the last day of July, sunrise is at 5:54 am and sunset at 6:36 pm IST.

Sunshine

In July, the average sunshine is 10.7h.

UV index

The months with the highest UV index in Chennai are April through July, with an average maximum UV index of 8. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 8 in July translates into the following recommendations:
Take important precautions because unprotected skin can burn and be harmed swiftly. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Caution! The mirror effect of sand and water ups the UV radiation strength.