Tamil Nadu is likely to see the northeast monsoon begin within the next two days, with the India Meteorological Department forecasting heavier rain from October 15 after a new low-pressure area forms over the southeast Bay of Bengal on October 13.
The weather system is expected to develop because of an atmospheric circulation over the region. The IMD said the southwest monsoon is likely to withdraw from Tamil Nadu within the next two days, paving the way for the northeast monsoon to begin.
The forecast has immediate implications for cities and towns across the state, where intense rain can affect roads, drainage systems, public transport and low-lying neighbourhoods. The IMD’s announcement comes as local administrations prepare for a shift from scattered rainfall to the seasonal northeast monsoon pattern.
Moderate rain is expected on October 13 in Thanjavur, Tiruvarur, Pudukkottai, Nagapattinam, Mayiladuthurai, Ramanathapuram, Thoothukudi, Tirunelveli and Kanniyakumari districts. Light rain is likely in the remaining districts, according to the weather centre’s forecast.
The low-pressure area over the southeast Bay of Bengal is expected to bring heavier rainfall to Tamil Nadu from October 15. The supplied forecast does not specify district-wise rainfall warnings, expected rainfall totals or any disruption advisories for transport and public services.
The northeast monsoon is a crucial seasonal rainfall period for Tamil Nadu, making the transition significant for urban water management as well as daily mobility. Authorities and residents will now be watching subsequent IMD updates for more detailed information on rainfall intensity, affected locations and any operational advisories.
