Heavy rain is likely to occur at isolated places over Tiruvallur, Chennai, Chengalpattu, Kancheepuram, Villuppuram, Ranipet, Vellore, Tirupattur, Tiruvannamalai, Krishnagiri, Dharmapuri and Ramanathapuram districts on Saturday (Oct 4), forecast India Meteorological Department (IMD). Thunderstorm and lightning is likely to occur at one or two places over Tamil Nadu, Puducherry and Karaikal area. Chennai is expected to receive one or two spells of moderate rain, intense at times with thunderstorm and lightning likely in some areas, IMD forecast. The maximum temperature is likely to be around 32°C -33°C, whereas the minimum is expected to be around 24°C-25°C. Places expected to receive rainfall Mayiladuthurai Karaikal Thiruvarur Thanjavur Tiruvallur Chennai Chengalpattu Villupuram Puducherry Kallakurichi Salem Namakkal Cuddalore Ariyalur Nagapattinam. Rainfall occurred at isolated places over the state on Friday (Oct 3). Dry weather prevailed over Puducherry and Karaikal area. Palayamkottai recorded the highest maximum temperature of 39.5°C over Tamilnadu. Karur Paramathi recorded the lowest minimum temperature of 22.5°C in the plains of Tamil Nadu.