Question

why is south India cooler than the north in summer

Answer 1

because in south area there is enormous amount of water is present and the cold breeze blows earlier in south then in the north are
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Answer 2

The reason is that south India is very close to equator. The sunlight of the sun falls directly on equator because it is horizontal across the sun and makes it the most hottest area of earth. North India is cooler because it is away from the equator and close to the north pole which is very cool.