Delhi witnessed the hottest day of the season earlier Friday with the maximum temperature recorded at 43.7 degrees Celsius, two notches below the season's average.
The sudden change in weather followed a massive storm that darkened the sky early in the evening, felled trees and forced tens of thousands to run and take shelter.
"The storm was so strong that it caused a pillar to fall on a parked car," said Ranjana Narayan, a journalist.
Delhi Metro services were hit on two of its busiest lines: Yellow and Blue.
Passengers tweeted that they were asked to de-board from the trains at some stations after technical faults caused by the storm hit the services hard on both these lines, leaving hundreds stranded.
The Met Office said the minimum temperature was recorded at 29.1 degrees Celsius, two notches above the season's average.