|Climate of Chennai is Tropical.
Chennai has mainly two seasons - summer (35 deg C - 42 deg C) Apr,May & June and monsoon (Oct, Nov and Dec). It receives scanty rainfall from the south-west monsoon (June to September) , but gets its bountiful rains from the north-east monsoon from October through December, thus amounting to about 125-150 cm of rainfall annually. Rainfalls occur usually from October to December. During some seasons, Chennai gets ample amount of rainfall if there are depressions in Bay of Bengal.
December to February are the mildest months temperature - (19 deg C - 28 deg C).
Climate is humid pretty much throughout the year because the city is on the coast. Summers are very hot and humid. Be sure take along light (not flimsy) clothing.