The Safdarjung observatory, whose recording is considered the official for the city, registered a maximum temperature of 38.6 degrees Celsius, five notches above the normal, making it the hottest day of March since 2011.
Across the State, the highest temperature on Wednesday was recorded in Adilabad at 41 degrees Celsius, while the lowest minimum temperature of 21 degree Celsius was recorded at Medak.
On being asked if the extreme temperature can be called a heatwave, Mr. Vishen said, "For the MeT department to declare it a heatwave, temperatures need to have crossed 40 degrees Celsius and need to be between 4-6.4 degrees above normal".
As per current trend, maximum temperature in Nagpur, Maharashtra, is expected to reach 44 degrees Celsius by April 1, which at present is 42 degrees.
Weather analysts fear that Delhi will also be swept by heatwave condition in the next few days.
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In Rajasthan, blistering heat continued to affect normal life in parts of the state as the mercury soared to 42.4 degrees Celsius in Barmer followed by 42.3 degrees in Jaisalmer.
Ahmedabad city reported maximum temperature of 41.8 degree Celsius. The Met office said the day temperatures were above normal in Varanasi, Faizabad, Jhansi and Agra. Hisar sizzled at 40 degrees Celsius. In Punjab, Patiala registered a maximum of 37 degrees Celsius, seven notches more than normal, while Ludhiana recorded 36.7 degrees Celsius.
Maximum temperature in Jaipur and Ajmer was 39.8 degrees.
With March yet to end, nine states across peninsular India's northwest, west, central and north are sizzling under the heatwave conditions, with maximum temperature hovering above 40 degrees Celsius on Thursday.
Kolkata witnessed a fall in day temperature today and was pleasant at 33.4 degrees Celsius, which is two notches below average, the weatherman said.