The hottest month in Tamil Nadu is April when the average maximum temperature is 35°, average temperature is 30° and average minimum temperature is 26°.
The coolest month in Tamil Nadu is January when the average maximum temperature is 31°, average temperature is 27° and average minimum temperature is 22°.
The longest days in Tamil Nadu are in June, with an average of 12.9 hours of daylight per day. December has the shortest days with an average of 11.3 hours of daylight per day.
The sunniest days in Tamil Nadu are in February which has the most hours of sunshine per day with an average of 9.5 hours of sunshine per day, making it a sunny month with few clouds. July has the least sunshine with an average of 5.5 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in April when it reaches 14.4 and lowest in December when it reaches 9.5.
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 July with 89.8cm of rain and the most days of rain with 25 days with some rain, a very wet time to visit the beach.
The driest month in Tamil Nadu is February with 0.3cm of rain and the least days of rain with 0.5 days with some rain, an extremely dry time to visit the beach.
The most humid month in Tamil Nadu is June 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 20° which is somewhat uncomfortable for most people in cities but fine on a beach.
The most windy month in Tamil Nadu is July when the average maximum windspeed is 20kmh and the average wind speed is 11kmh.
The least windy month in Tamil Nadu is November when the average maximum windspeed is 13kmh and the average wind speed is 6kmh.