The national capital experienced the hottest February day in the last two years on Friday, with temperatures reaching 29.8 degrees Celsius, six degrees above the season's normal, according to the Met Office.
The city reported a low of 12.8 degrees Celsius in the morning, which was two degrees below usual.
The relative humidity ranged between 93 and 45 per cent.
The city will have a clear sky and shallow fog in the morning, according to the India Meteorological Department. The highest and minimum temperatures are expected to be about 31 and 12 degrees Celsius, respectively, according to the IMD.
According to Central Pollution Control Board data, Delhi had a 24-hour average Air Quality Index (AQI) of 367 on Friday.
The country's daytime temperatures have been steadily climbing as winter draws to a close. In some places, the temperature has already risen above average. The daytime temperature in Bhuj, Gujarat, on February 16 reached 40.3 degrees Celsius, according to the India Meteorological Department (IMD).
According to the IMD, the temperature recorded in Bhuj is the highest for the month of February. Temperature records for Bhuj have been kept since 1952.
According to Vijin Lal, a meteorologist with the IMD Ahmedabad meteorological centre, the previous maximum day temperature for February was 39 degrees Celsius on February 19, 2017.
IMD ascribed the temperature increase to a delay in north-easterly winds and other factors.
"This time we are having clear skies and north-easterly wind, and sea breeze in the coastal region is getting delayed," Lal said when asked about the causes for the temperature rise, according to PTI.
Temperatures will remain high in regions of northern Gujarat and Saurashtra-Kutch. But, according to the IMD's forecast, there is no chance of a heat wave in the state.
Ahmedabad's skies will remain clear, with night temperature hovering around 16 degrees Celsius. According to the forecast, the highest temperature in the city will be about 39 degrees Celsius until Saturday.
The month of February marks the transition from winter to summer, with days recording lower minimum and higher maximum temperatures.
(With Inputs From PTI)