Climate of Tirunelveli district in Tamil Nadu during the day time in the coastal regions is cooler than the interior parts by about a degree during summer and southwest monsoon seasons and warmer by one to two degrees during the rest of the year. Starting from the mid February, temperature increases steadily. In the month of May, which is generally the hottest month in the interior parts of the district, the mean daily maximum temperature is 37.1 degree Celsius. The weather is reasonably hot in the months of May and June and the maximum temperature during this period reaches forty five degree Celsius. With the coming of the south-west monsoon in the end of the month of May or in the beginning of June, Mercury drops to some extent. By about mid-October, there is a substantial decrease in both the night and day temperatures.

The period from the months of November to January, the district experiences the coolest part of the year with the mean daily maximum temperature of about thirty to thirty one degree Celsius in the interior parts. The mean daily minimum temperature in these months in general is about twenty two degree Celsius to twenty three degree Celsius. The relative humidity in general, in this period of the year, is between fifty five and sixty five percent in the interior parts of the district, except during the north-east monsoon season, when it is over sixty five percent. The coastal parts of the district of Tirunelveli in Tamil Nadu state are comparatively more humid. In the months of April and May, the skies get heavily clouded and thunderstorms on many days follow in the afternoons. In the south-west and north-east monsoon seasons, the sky is overcast or heavily clouded. Winds in this district blow generally light to moderate in strength and between the months of May and September winds are generally north-westerly or westerly and from the month of October to February winds are usually north-easterly or northerly.

The major rainy season in the Tirunelveli district is from the month of October to mid-January. During these south-west monsoon season the rainfall is more in the western parts of the district of Tamil Nadu state and the month of November is generally the rainiest month in this district. The average annual rainfall in the district of Tirunelveli is 814.8 millimeters.