Chennai was a surplus of 29%among the districts that received excess rainfall, this southwest monsoon. File | Photo Credit: Hind
It is expected that the northeast monsoon above the southern peninsula, including Tamil Nadu, will be above normal this year.
Seasonal precipitation between October and December above the southern peninsula, including Tamil Nadu and Coastal Andhra Pradesh, will most likely be 112% of the diameter of the long period (33.4 cm).
According to the Regional Meteorological Center (RMC), the seasonal view of the Indian Meteorological Department (IMD) was released for the whole region. Most parts of Tamil Nadu are likely to experience normal precipitation. In some extreme southern districts, rainfall may be under normal.
RMC officials said Tamil had usually received an average of 44 cm during the northeast monsoon. There is a chance that the state will receive up to 50 cm of precipitation. IMD noted that during October December the probability of 71% for the development of La Nina conditions. (La Nina refers to the cooling of the sea surface in the equatorial pacific that changes atmospheric circulation and affects precipitation).
B. Amudha, Head, (Others in charge), RMC, said that in the past, Tamil had experienced poor and excess collisions over the years. “There is no direct reference to La Nina. We must monitor the development of these conditions to determine its impact,” she added.
Meanwhile, cooking the fresh weather system in Bengal will probably affect scattered precipitation over Tamil over the next five days. Some North and Delta districts can experience heavy Rainpells by October 4. On Thursday, there are probably heavy rainfall in the ChengalPatt, Villupuram, Kallakurichi and Tiruvannamei districts.
RMC officials said that on Wednesday the low pressure area, intensifies into depression and crosses the coast of South Odisha-North Andhra Pradesh 3. October. However, parts of Tamil Nadu can also get rainfall as the system approaches.
Delayed withdrawal
At a virtual press conference on Tuesday, IMD meteorology CEO M. Mohapatra said that the evolving weather system stopped the withdrawal of the southwest monsoon. A total withdrawal may be delayed by a week after 12 October. This could, in turn, enforce the conditions for the onset of the northeast monsoon.
Mohapatra added that the October precipitation will be above normal, except for some extreme southern districts that could receive under normal collision. This year the southwest monsoon officially ended on Tuesday with a normal collision over Tamil Nadu. RMC officials said the state received 32.5 cm of precipitation, which is 1% lower than the average rainfall of 32.8 cm. However, it is still considered a normal monsoon.
Many districts, including Virudhunagar, Tiruppur, Ramanathapuram and Karur, have seen rain deficits and downloaded the overall average of the state. Chennai was among excess districts with 29% excess precipitation.
Published – September 30, 2025 21:37
