CHENNAI: The Meteorological Department on Thursday warned that a heatwave may prevail until April 28 and the temperature might increase in some places more than usual.

The 18 districts of Tamil Nadu that will face the heat wave are reported to be Tirupattur, Vellore, Ranipet, Kallakurichi, Tiruvannamalai, Kancheepuram, Krishnagiri, Dharmapuri, Salem, Namakkal, Karur, Erode, Nilgiris, Coimbatore, Tirupur, Trichy, Ariyalur and Perambalur, and the temperature will rise from 3 degrees Celsius to 5 degrees Celsius, stated a report.

Of these, Tirupattur, Vellore, and Coimbatore may record as high as 4 degrees Celsius to 7 degrees Celsius above normal from Friday to Sunday.

The temperature in other places in the State will reach a maximum of 38 degrees Celsius.

The Meteorological Department also said there is a possibility of light rain in some places in the southern districts of Tamil Nadu.