The maximum temperature in Delhi on Wednesday was recorded at 43.4 degree Celsius, one notch below the previous day's, but three notches above the season's average.
Rain in areas surrounding the national capital has caused a slight drop in the temperatures.
The India Meteorological Department (IMD) said the heatwave will cease in the next two days as monsoon starts moving towards the northern direction along with moisture-laden winds from the Arabian sea.
IMD scientist D.S. Pai said rain is likely in the northern India in the next two days owing to snowfall in Kashmir and Cyclone Vayu.
"After Cyclone Vayu in two days, monsoon will move northwards which will end the heatwave," he said.
In the past few days, several people have died due to heat stroke. They included four passengers of Kerala Express who died on Monday when the train was passing through Jhansi, Uttar Pradesh.
On Wednesday, the mercury hovered around 45 degree Celsius in many parts of Rajasthan such as Churu, Sri Ganganagar. Heatwave conditions were witnessed in parts of central and northern parts of the country as well.
On Wednesday, there are chances of duststorm, thunderstorm and light rains in the evening in Delhi.
On Tuesday, the national capital experienced heatwave conditions as the maximum temperature touched 44.5 degree, which was five notches above the season's average.
On Monday, the mercury in Delhi had crossed 48 degree Celsius, breaking all-time record of being the hottest day in June.
In case there is no rain in Delhi on Wednesday evening, the temperature may remain high for the next two days, but there will be no heatwave, as per the private forecaster Skymet.
"There are chances that rain may occur in Delhi on Saturday and Sunday," said Mahesh Palawat, director, Skymet.
( With inputs from IANS )