There are other places in Karnataka and other parts of Southern India which are also cooler like Coorg, Ooty,Munnar,Araku Valley,etc but these places are hill stations and Bangalore isn’t,then why still Bangalore is cooler than other parts of India?
Its due to various reasons that make Bengaluru way more cooler than other places.
1.Bengaluru’s Elevation- Bengaluru elevation is at 900 meters or 3000 ft from the sea level and higher the elevation of a place its cooler also- One can experience this change in elevation when one travels from Vellore or Salem to Bengaluru. From Vaniyambadi(a town in Tamil Nadu), as one travels through car/bike/bus he can notice that the elevation keeps on gradually increasing as one comes by Hosur 90% elevation is achieved(that’s why even Hosur has similar climate like Bengaluru).
2.Lot of trees and water bodies- Its told that Bengaluru was once a dense forest with many snakes and wild animals likes leopards and elephants. Slowly it turned to village then to a city. It lost its forest cover, water bodies(lakes) . The surrounding areas like Bannerghatta is a elephant corridor and the areas like Hosakote and Malur now also leopards are spotted.
3. Surrounded by hills-Bangalore is surrounded by hills- Eastern ghats towards south and east. Other mountain ranges on its west and north(like the Nandi hills).
4.Rains - Bangalore is at a position and the only place that receives both the South west and north east monsoons and no other places enjoys both the monsoon rains so equally. Even Summer rains make the city cool as soon the city gets hot(Thanks to the green cover of the city).
5.Soil- Bangalore’s soil is very fertile and the soil type is lake soil which is very rich in minerals and has a capacity to retain water even during summers. Dig anywhere in Bengaluru and within 1 to 2 metre’s you will get fresh water (nowadays it has turned salty in some parts) making the soil/land to remain cooler.
All these factors are perfect for the city to remain cooler.