Ebenezer News Explainer DeskExplainers are written from our published summary and its cited sources, then checked against them.22 Oct 2026, 04:26 pmUpdated 2h ago4 min readIndiaIndia
The Northeast monsoon has strengthened over Tamil Nadu, bringing heavy to very heavy rainfall to many districts until October 26. This matters because it's reversing a dry October and could cause river levels to rise, affecting communities and infrastructure across the state.
Simple details
Tamil Nadu has received 13.3 cm of rain this October, which is nearly 23% above the normal share of 10.8 cm.
Ezhudesam in Kanniyakumari district received 15 cm of very heavy rainfall in the past 24 hours.
26 districts in the south, interior, and Western Ghats regions are on yellow alert for heavy rainfall.
Squally winds reaching up to 50 kmph are expected in Kanniyakumari, Nilgiris, and Coimbatore on Friday.
The Central Water Commission has warned of rising water levels in rivers including Moyar, Bhavani, and Noyyal until October 24.
What is happening now
The Regional Meteorological Centre has issued orange and yellow alerts for several districts. These warnings cover areas in the south, interior, and Western Ghats regions.
Rain clouds are expected to linger over the state for the next few days. The active monsoon phase is sustaining rainfall momentum until October 26.
Some areas will face intense downpours. Chennai is likely to receive isolated spells of heavy rain till Saturday.
Rainfall intensity is expected to go up from October 25, according to the RMC. You should stay prepared for sudden changes.
Who is affected by the rain
The rainfall is bringing relief to a state that had a dismal picture earlier in the month. However, the intensity creates specific risks for different groups.
Farmers in the Western Ghats and southern districts who rely on timely monsoon rains for their crops.
Residents in low-lying areas of Chennai and north Tamil Nadu who may face waterlogging and travel disruptions.
Communities living near rivers such as the Moyar, Bhavani, and Noyyal, which are warned to rise.
Travelers on highways in districts like Kanniyakumari, Nilgiris, and Coimbatore, where squally winds are expected.
How we got here
Tamil Nadu typically receives the bulk of its rainfall from the Northeast monsoon, which is active during October and November. This season is critical for the state's water security.
Earlier in October, the state faced a deficit compared to normal expectations. The current weather system has changed that trend significantly.
A low pressure area has been persisting over Comorin and adjoining south Tamil Nadu, driving the recent increase in rainfall. It's a welcome shift for many.
Reality check
While the rain is welcome, it brings significant challenges. The Central Water Commission has cautioned that water levels could rise in several rivers, including the Moyar, Bhavani, and Noyyal.
Inflows may also increase in reservoirs like Pechiparai and Perunchani. This rapid rise can strain local infrastructure and emergency services.
Authorities may need to issue evacuation orders if flooding worsens. You don't want to be caught off guard by sudden water levels.
Who should buy and who should skip
Buy: Travel insurance for trips to the Western Ghats or coastal areas, as sudden weather changes can disrupt plans.
Buy: Backup power supplies, because heavy rain often leads to power cuts in affected districts.
Skip: Outdoor events in Kanniyakumari or Coimbatore on Friday, due to warnings of squally winds and very heavy rain.
Skip: Driving on low-lying roads in Chennai on Sunday and Monday, when downpours are likely.
What happens next
The immediate future of the rain depends on the movement of the low pressure area. Meteorologists are watching how this system develops over the Bay of Bengal.
Watch for the development of a low pressure area in the Bay of Bengal on Friday, October 23, which could intensify the rain.
Monitor river levels in Coimbatore, Nilgiris, and Kanniyakumari, as the Central Water Commission has warned of rising water.
Track rainfall in north Tamil Nadu, including Chennai, which may see downpours on Sunday and Monday, October 25 and 26.
Check for updates on reservoir inflows, particularly in Pechiparai, Perunchani, Manimuthar, and Papanasam, which may see increased water levels.
Verdict
This is a critical period for Tamil Nadu's water resources. The rain is much needed, but you should stay alert to official alerts. If you live in a river basin or low-lying area, prepare for possible flooding. The situation will become clearer as the low pressure area develops in the Bay of Bengal.
