India, June 28 -- New Delhi

Notwithstanding predictions of rainfall and thunderstorms over the weekend falling flat, Delhi recorded one of the sultriest days of this summer as it clocked a heat index or "real feel" temperature of 51.3 degrees Celsius (degC) and a peak wet-bulb temperature of 29.77degC, according to the India Meteorological Department (IMD).

The humidity levels were between 35% and 63% on the day, and is set to remain high, experts said, predicting muggy days to continue. They said that the city's humidity levels were high due to a confluence of weather activity.

"Currently there are southwesterly winds from the Arabian Sea, which are feeding moisture over Pakistan and northwestern India, which are increasing the humidi...