As the temperatures are expected to be above normal between two and three degrees Celsius, combined with high humidity, the heatwave is expected to cause discomfort in coastal areas of Tamil Nadu and Puducherry till May 5.

A bulletin from the Regional Meteorological Centre in Chennai said that the temperature in Chennai (Meenambakkam), Erode, Karur, Nagapattinam and Vellore districts in the state will be above normal between two and three degrees Celsius.