IMD issues heavy rain alert for 5 Tamil Nadu districts, wet spell to last a week
Synopsis
A trough stretching from the southeast Arabian Sea to the central Bay of Bengal is keeping Tamil Nadu unsettled. Five hill and adjoining districts face heavy rain warnings on Thursday, with the system set to expand to at least ten more districts by Friday — and forecasters say there is no clear break for at least a week.
Key Takeaways
The IMD has issued a heavy rainfall warning for Coimbatore, Nilgiris, Theni, Erode, and Dindigul on Thursday, 22 May .
A trough from the southeast Arabian Sea to the central Bay of Bengal is driving the wet spell.
Rainfall activity is set to spread to Salem, Dharmapuri, Krishnagiri, Namakkal, Tiruchy, Tirupattur, Tiruvannamalai, Vellore, Erode, and Nilgiris by Friday, 23 May .
Unsettled conditions are forecast to continue across Tamil Nadu and Puducherry for at least one more week .
Chennai is expected to remain hot and humid, with temperatures near 40°C , largely outside the active rain zone.
The India Meteorological Department (IMD) has forecast heavy rainfall across five districts of Tamil Nadu on Thursday, 22 May, warning that unsettled weather is likely to persist across the state and Puducherry for at least another week. The alert covers hilly and adjoining areas most vulnerable to waterlogging, landslides, and traffic disruptions.
Districts Under Heavy Rain Warning
The IMD has specifically flagged Coimbatore, Nilgiris, Theni, Erode, and Dindigul districts for heavy rainfall on Thursday. The Nilgiris district — which routinely bears the brunt of intense spells during active weather systems — is expected to receive significant showers, while localised heavy downpours may disrupt normal life in the hilly belts of Coimbatore, Theni, and Dindigul.
Authorities have urged residents in these areas to exercise caution, particularly those in locations prone to waterlogging and slope instability.
What Is Driving the Wet Spell
According to weather officials, a trough extending from the southeast Arabian Sea to the central Bay of Bengal is influencing atmospheric conditions over the region. This system is sustaining enhanced rainfall activity across several parts of Tamil Nadu and is expected to remain active over the coming days, keeping weather patterns unsettled.
Conditions Expected to Spread on Friday
The IMD has indicated that rainfall activity is likely to intensify and spread to additional districts by Friday, 23 May. Strong rain accompanied by gusty winds has been forecast for Salem, Dharmapuri, Krishnagiri, Namakkal, and Tiruchy districts. Similar conditions are also expected in Tirupattur, Tiruvannamalai, Vellore, Erode, and Nilgiris districts. This marks a notable geographic expansion of the weather system's influence within a 24-hour window.
Chennai Stays Hot Despite Statewide Rain
While much of the state braces for rain, Chennai is likely to experience hot and humid conditions, with the maximum temperature expected to hover around 40 degrees Celsius. The contrast underscores how unevenly distributed the rainfall system is — the capital remains largely outside the active rainfall zone even as interior and hill districts face heavy spells.
What Residents Should Do
Officials have advised the public to follow IMD updates regularly and exercise caution in districts under heavy rainfall and gusty wind warnings. The rainfall is expected to provide some relief from the prevailing summer heat in several interior districts, though isolated areas may also experience brief but intense downpours. Intermittent showers and changing weather patterns are likely to continue across many regions as the atmospheric system remains active.
Point of View
In particular, has a documented history of slope failures during prolonged rain spells. What the forecast does not address is whether district administrations have activated early-warning and evacuation protocols, or whether the alert will translate into on-ground preparedness. The Chennai contrast — baking at 40°C while the hills flood — also highlights the persistent infrastructure gap: the city's drainage system has historically struggled even with moderate rain, and any southward shift in the system could quickly change that calculus.
NationPress
16 Jul 2026
Frequently Asked Questions
Which Tamil Nadu districts are under heavy rain alert on 22 May?
The IMD has warned of heavy rainfall in Coimbatore, Nilgiris, Theni, Erode, and Dindigul on Thursday, 22 May. These districts include hilly and adjoining areas particularly vulnerable to waterlogging and landslides.
How long will the wet spell last in Tamil Nadu?
According to the IMD, unsettled weather conditions are expected to persist across Tamil Nadu and Puducherry for at least one more week. The atmospheric system driving the rainfall remains active over the region.
What is causing the heavy rainfall in Tamil Nadu?
A trough extending from the southeast Arabian Sea to the central Bay of Bengal is influencing atmospheric conditions over Tamil Nadu, sustaining enhanced rainfall activity across several parts of the state.
Will Chennai receive heavy rain during this spell?
Chennai is not under a heavy rain warning at this time. The city is expected to remain hot and humid, with maximum temperatures near 40 degrees Celsius, even as interior and hill districts receive significant rainfall.
Which additional districts face rain warnings on 23 May?
On Friday, 23 May, heavy rain with gusty winds is forecast for Salem, Dharmapuri, Krishnagiri, Namakkal, Tiruchy, Tirupattur, Tiruvannamalai, Vellore, Erode, and Nilgiris districts, marking a geographic expansion of the active weather system.
