The Safdarjung observatory, whose recording is considered the official figure for the city, recorded a maximum temperature of 42.5 degrees Celsius, five notches above the season's average.
"It is the hottest day in in April since 2010 when the maximum temperature had settled at 43.7 degrees Celsius," Ravinder Vishan, the in-charge at the Regional Weather Forecasting Centre (RWFC) said.
Areas under Palam, Lodhi Road, Ridge and Ayanagar registered a maximum temperature of 43.7, 41.8, 43.4 and 42.6 degrees Celsius, respectively, a MeT department official said.
Humidity levels oscillated between 76 and 15 per cent.
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According to the Met office, the city is likely to reel under heatwave-like conditions for the rest of the days in this week.
The weatherman has predicted mainly clear skies for tomorrow.
"The maximum and minimum temperatures are expected to hover around 42 and 27 degrees Celsius, respectively," the official said.
Yesterday, maximum and minimum temperatures were recorded at 41.2 and 25.5 degrees Celsius, respectively.