The Regional Meteorological Centre (RMC) has warned that heatwave conditions are likely in isolated parts of 19 districts on July 16. The affected districts include Tirupathur, Vellore, Ranipet, Kallakurichi, Tiruvannamalai, Kancheepuram, Krishnagiri, Dharmapuri, Salem, Namakkal, Karur, Erode, Tiruchirappalli, Ariyalur, Perambalur, Sivaganga, Virudhunagar, Dindigul and Madurai.
Maximum temperatures across Tamil Nadu, Puducherry and Karaikal are expected to remain 2°C to 4°C above normal on July 16 and 17. The weather department expects no significant change in temperatures on July 18 and 19.