Tamil Nadu witnessed widespread but uneven rainfall between August 31 and September 1, with heavy showers lashing coastal and northern districts. The rainfall was concentrated over north coastal Tamil Nadu, Puducherry, and parts of Salem district, bringing much-needed relief from the humid conditions in Chennai and its surrounding areas.
According to the India Meteorological Department (IMD), Puducherry recorded the highest rainfall at 54 mm, followed by Nungambakkam in Chennai with 29.2 mm and Salem with 22 mm. In contrast, Meenambakkam (Chennai) received only 2.1 mm, Cuddalore registered a negligible 0.1 mm, Valparai in Coimbatore district reported 0.6 mm, and Tiruchirappalli airport saw only traces of rain.
Data from Automatic Weather Stations (AWS) highlighted significant local variations. The Chennai AWS recorded 31 mm, while VIT Chennai in Chengalpattu received 15.5 mm and New Chennai Township 13.5 mm. Hosur in Krishnagiri registered 5 mm, while Tiruvallur’s Jaya Engineering College and Tiruttani recorded 5 mm and 2.5 mm, respectively. Mahabalipuram also logged 2.5 mm.
From the Agro stations, Sandhiyur in Salem district reported the highest with 28 mm, while Vamban in Pudukottai recorded 2 mm.
Among Automatic Rain Gauge (ARG) stations, Goodwill School in Villivakkam (Tiruvallur) received 14 mm, followed by Poonamallee with 12.5 mm. In Kanchipuram district, ACS Medical College and Hindustan University recorded 7.5 mm and 5.5 mm, respectively, while Pudukottai also registered 7.5 mm.
Smaller amounts between 1 mm and 3 mm were reported from several locations, including Vazhapadi (Salem), Kolapakkam, Chembarambakkam, West Tambaram, Anna University (Chennai), Puzhal, and Cheyyar.