Chennai is under a red alert on 18 October 2026 for extremely heavy rainfall, as the northeast monsoon continues to batter Tamil Nadu, leaving several localities in the city and its suburbs inundated and roads waterlogged. School Education Minister Rajmohan said on Sunday that a decision on school closures would be taken at an 'appropriate time,' stopping short of announcing a holiday.

Red Alert for Chennai, Orange Alerts Across Tamil Nadu

The Meteorological Department has placed Chennai under a red alert — the highest level of weather warning — indicating extremely heavy rainfall. Orange alerts have been issued for Chengalpattu, Tiruvallur, Theni, Coimbatore, and the Nilgiris. Heavy rain has also been forecast across 26 districts, including Tiruchirappalli, Madurai, and Pudukkottai, pointing to a widespread wet spell that stretches from the northern coastal belt to the western hills.

The alerts span a broad geographic sweep of Tamil Nadu, underscoring the scale of the current weather event. The pattern suggests the northeast monsoon, which made its onset over Tamil Nadu on 15 October, is intensifying rather than tapering in its opening phase.

What Caused the Flooding

Heavy rain lashed Chennai and its surrounding areas on Saturday, 17 October, leaving multiple neighbourhoods waterlogged. Rainwater was subsequently cleared through stormwater channels and motor pumps. However, with further downpours forecast, authorities face renewed pressure to manage urban drainage effectively.

This is not an isolated event — Chennai has repeatedly faced severe urban flooding during the northeast monsoon, which typically runs from October to December and accounts for the bulk of the city's annual rainfall. Infrastructure stress during early-season downpours has historically been a pressure point for civic management in the region.

What the Government Said

Speaking to reporters, School Education Minister Rajmohan said the government would factor in inputs from the meteorological centre as well as private weather observers before deciding on school holidays. 'We will decide at the appropriate time whether to declare holidays for schools and how to handle the situation, based on information from the meteorological centre and private weather observers,' he said.

Rajmohan did not specify a timeline for the announcement or name any districts where holidays might be declared. The response indicates a wait-and-watch approach, with authorities seeking to calibrate any disruption to school schedules against real-time weather data.

Impact on Citizens and What to Expect Next

Residents across Chennai and the flagged districts face continued disruption as the wet spell is expected to persist. Parents and school administrators remain in a state of uncertainty pending an official declaration on closures. Commuters in flood-prone areas have been dealing with waterlogged roads since Saturday, with civic workers deployed to assist drainage efforts.

As the northeast monsoon deepens its hold over Tamil Nadu, the coming days will be critical — both for weather-related safety measures and for government decisions on schooling and public movement across the state.