A low-pressure area has formed over the southwest Bay of Bengal near Sri Lanka, raising the likelihood of intensified northeast monsoon activity for three days from October 21 to October 23, according to weather officials.
Chennai, Kancheepuram and surrounding districts witnessed heavy overnight rain. Civic teams were deployed to clear waterlogging from roads as rainfall continued into the morning.
The weather department has forecast rain across several parts of Tamil Nadu on Wednesday as well.
Rainfall recorded in the 24 hours ending 6 am on October 21 showed the highest readings at Vadapalani (131 mm), Saidapet (122 mm) and Kolapakkam (121 mm). Other notable totals included Alandur (115 mm), Valasaravakkam (109 mm), Madipakkam and Maduravoyal (107 mm each), Nerkundram (106 mm), Nungambakkam (105 mm) and Adyar (101 mm).
Due to the heavy rain, a holiday was declared for schools on October 21 in Chennai, Tiruvallur, Kancheepuram, Chengalpattu and Ranipet districts.
