The hottest month in Tamil Nadu is May when the average maximum temperature is 38°, average temperature is 32° and average minimum temperature is 27°.
The coolest month in Tamil Nadu is January when the average maximum temperature is 31°, average temperature is 26° and average minimum temperature is 21°.
The longest days in Tamil Nadu are in June, with an average of 12.7 hours of daylight per day. January has the shortest days with an average of 11.6 hours of daylight per day.
The sunniest days in Tamil Nadu are in March which has the most hours of sunshine per day with an average of 8.9 hours of sunshine per day, making it a sunny month with few clouds. November has the least sunshine with an average of 6.1 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in March when it reaches 14.7 and lowest in December when it reaches 10.6.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Tamil Nadu are found in April when they peak at 30° and lowest in January when they dip to 27°.
The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Tamil Nadu is October with 3.2cm of rain and the most days of rain with 10.3 days with some rain, a slightly wet time to visit the beach.
The driest month in Tamil Nadu is January with 0cm of rain and February has the fewest days of rain with 0.4 days with some rain, an extremely dry time to visit the beach.
The most humid month in Tamil Nadu is April with a dew point (an indicator of humidity) of 25° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
The least humid month in Tamil Nadu is January with a dew point of 22° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.
The most windy month in Tamil Nadu is July when the average maximum windspeed is 36kmh and the average wind speed is 22kmh.
The least windy month in Tamil Nadu is April when the average maximum windspeed is 23kmh and the average wind speed is 8kmh.