Mumbai recorded a maximum temperature of 39.7 degrees Celsius on Tuesday, becoming the hottest day in April in the metropolis since 2009, the Indian Meteorological Department (IMD) said on Wednesday.

On April 16, the Santa Cruz-based observatory (representative of Mumbai suburbs) recorded a maximum temperature of 39.7 degrees Celsius, the IMD official said.

The mercury reading at Colaba Observatory (representative of south Mumbai) was 35.2 degrees Celsius.

"Our Santa Cruz-based observatory recorded a temperature of 39.7 degrees Celsius yesterday (Tuesday), which was the highest temperature in the last 14 years (April 1)," said Sushma Nair, scientist at IMD Mumbai.

He told that on April 2, 2009, the maximum temperature of the metropolis was recorded at 40.6 degrees Celsius.

On Monday, Colaba and Santa Cruz observatories had recorded maximum temperatures of 37.9 degrees Celsius and 34. degrees Celsius respectively.

For the last two days (Monday and Tuesday), the IMD had issued heat wave warnings for Mumbai and neighboring Thane and Raigad districts. Temperatures remained above 4 degrees Celsius in parts of Thane and Raigad districts on both days, although the mercury did not cross that level in the finance capital.

However, Mumbaikars got some respite from rising temperatures on Wednesday, with Colaba and Santa Cruz observatories recording maximum temperatures of 34 degrees Celsius and 34.7 degrees Celsius respectively.

IMD officials said they were expecting a moderate drop in the maximum temperature in Mumbai on Wednesday, but the actual drop was heavy and sudden.

"We were expecting a drop of 2-3 degrees Celsius in the temperature, but it actually fell by 4-5 degrees Celsius," Nair said.

Although the temperature has dropped, the increased humidity made Mumbaikars sweat a lot. Colaba and Santa Cruz observatories recorded 78 per cent and 7 per cent relative humidity respectively.