Chennai recorded exceptionally heavy rainfall overnight, with Parrys Corner receiving 361 mm by 5.30 am on October 18, as water surrounded homes in parts of North Chennai and Kanchipuram, according to a report by Dinamalar. The downpour followed the onset of the northeast monsoon in Tamil Nadu and intensified across the city after light rain began at about 6 pm on October 17.
Rainfall continued through the night, with heavy showers lasting until midnight and accumulating across several parts of Chennai. Dinamalar reported that more than 30 locations received over 100 mm of rain during the spell, highlighting the uneven intensity of the event across the metropolitan area.
Parrys Corner recorded the highest total at 361 mm, followed by Kathivakkam with 344 mm and Meenambakkam with 284 mm. Sathangadu received 260 mm, while Tiruvottiyur and Ennore recorded 223 mm and 215 mm respectively.
Several other parts of the city also recorded substantial rainfall. Kargil Nagar received 192 mm, Saidapet 170 mm, Tondiarpet 164 mm, Kolapakkam 161 mm, Basin Bridge and Vepery 154 mm each, and Nungambakkam 149 mm. Pudhupet recorded 142 mm, while Egmore received 138 mm.
Rainfall totals also crossed 100 mm at Alandur, Palavanthangal, Pulianthope, Madhavaram, Arumbuliyur, Chennai Central and Valasaravakkam. The reported totals were measured up to 5.30 am on October 18, making the event one of the most intense early-season rainfall spells recorded across multiple Chennai stations in the report.
The heaviest impact was reported in North Chennai, where rainwater surrounded residential areas. Waterlogging was also reported in Kanchipuram. The affected locations include several dense and heavily built-up parts of the metropolitan region, where intense rainfall can quickly disrupt local movement and access to homes, although the report did not provide details on road closures, public transport operations, power supply or evacuation measures.
The rainfall came as Tamil Nadu entered the northeast monsoon period, which typically brings a significant share of the state’s annual precipitation. For Chennai, the first major spells of the season place immediate pressure on storm-water channels, low-lying neighbourhoods, road networks and local pumping arrangements. The report, however, did not provide an official assessment of drainage operations or the municipal response.
The rainfall figures reported by Dinamalar were: Parrys Corner 361 mm, Kathivakkam 344 mm, Meenambakkam 284 mm, Sathangadu 260 mm, Tiruvottiyur 223 mm, Ennore 215 mm, Kargil Nagar 192 mm, Saidapet 170 mm, Tondiarpet 164 mm, Kolapakkam 161 mm, Basin Bridge 154 mm, Vepery 154 mm, Nungambakkam 149 mm, Pudhupet 142 mm, Egmore 138 mm, Alandur 137 mm, Palavanthangal 128 mm, Pulianthope 126 mm, Madhavaram 126 mm, Arumbuliyur 124 mm, Chennai Central 120 mm and Valasaravakkam 120 mm.
The next operational milestone will be the authorities’ assessment of water levels, road conditions and drainage across the affected areas as rainfall conditions develop during the northeast monsoon.
