On Sunday, the Najafgarh area of Delhi registered the hottest temperature in the country this season, 47.8 degrees Celsius.
According to the meteorological forecast, the heat wave will likely continue this week.
The scorching heat comes as India has its general election, the results of which will be announced on June 4.
Indian summers, which last from March to September, are typically hot and humid.
The Indian Meteorological Department (IMD) predicts longer and more extreme heatwaves this year.
On Saturday, temperatures exceeded 45 degrees Celsius in 10 areas in the National Capital Region (NCR), which includes Delhi and several regions.
