“Maximum temperature is likely to be 2-4 degree C above normal over Chennai, Tiruvallur, Kancheepuram, Chengalpattu, Ranipet, Vellore, Tirupattur, Dharmapuri, Salem, Namakkal, Karur, Tiruchy, Perambalur, Ariyalur, Kallakurichi, Tiruvannamalai, Villupuram, Cuddalore, Nagapattinam, Mayiladuthurai, Tiruvarur and Thanjavur districts over the next 24 hours,” said an official from the Regional Meteorological Centre, Chennai.