CHENNAI: Regional Meteorological Centre has issued a yellow alert for several districts in Tamil Nadu and Puducherry, warning of heavy rainfall at isolated places over the next few days.
The alert covers six districts today, expanding to seven districts on Tuesday, 22 districts on Wednesday, and 11 districts on Thursday, as the region braces for unstable weather conditions.
According to the latest update, heavy rainfall is likely today over Tirupattur, Dharmapuri, Salem, Tiruvannamalai, Chengalpattu, Villupuram districts, and Puducherry.
On Tuesday, the alert includes Erode, Krishnagiri, Dharmapuri, Tirupattur, Salem, Vellore, and Tiruvannamalai districts.
The intensity of the rainfall is expected to rise on Wednesday, impacting Krishnagiri, Dharmapuri, Salem, Tirupattur, Vellore, Ranipet, Kancheepuram, Chengalpattu, Tiruvannamalai, Kallakurichi, Villupuram, Tiruchirappalli, Theni, Dindigul, Erode, Nilgiris, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Pudukkottai districts, along with Puducherry and Karaikal areas. By Thursday, the rainfall is expected over Nilgiris, Erode, Krishnagiri, Dharmapuri, Salem, Vellore, Tirupattur, Ranipet, Tiruvannamalai, Kancheepuram, Chengalpattu, Tiruvallur, Ranipet, Vellore, and Kancheepuram districts.
Meanwhile, temperature trends are showing a rise of 2-3°C in maximum temperatures across some pockets of Tamil Nadu and Puducherry. Palayamkottai recorded the highest maximum temperature of 38.5°C, while Karur Paramathi reported the lowest minimum temperature in the plains at 21.5°C. The meteorological update also indicates a significant change in atmospheric conditions.
The low pressure area over North Telangana and adjoining Vidarbha, which was prominent yesterday, has now become less marked as of this morning. The associated Upper Air Cyclonic Circulation has shifted towards East Vidarbha and now extends up to 3.1 km above mean sea level, tilting southwestwards. In the Bay of Bengal, a persistent Upper Air Cyclonic Circulation continues to extend up to 3.1 km above mean sea level.
Rainfall occurred at isolated places overTamilnadu. Dry weather prevailed overPuducherry and Karaikal area.
Rise in maximum temperature by 2-3°Cat a few pockets over Tamilnadu & Puducherry and no large change in maximum temperature over rest Tamilnadu and Karaikal area during the past 24 hrs.
Maximum temperatures were above normal by 2-3°C ata fewpockets over Tamilnadu and generally near normal over rest Tamilnadu,Puducherry& Karaikal area during the past 24 hrs.
Palayamkottairecorded the highest maximum temperature of38.5°C over Tamilnadu.
Karur Paramathirecorded the lowest minimum temperature of 21.5°C in the plains of Tamilnadu.
Yesterday’s Low Pressure Area over North Telangana and adjoining Vidarbha has become less marked at 0530 IST of today, the 15th September, 2025. The associated Upper Air Cyclonic Circulation over North Telangana and neighbourhood now lies over East Vidarbha and neighbourhood and extends up to 3.1 km above mean sea level tilting southwestwards with height.
Yesterday’s Upper Air Cyclonic Circulation over Southeast Bay of Bengal persists and now extends upto 3.1 km above mean sea level.
Yesterday’s Trough from Cyclonic Circulation associated with the Low Pressure Area has become less marked.
Day 1 (15.09.2025) Light to moderate rain is likely to occur at a few places over North Tamilnadu, at isolated places over South Tamilnadu and over Puducherry & Karaikal area with thunderstorm & lightning at one or two places.
Heavy rain is likely to occur at isolated places over Tirupattur, Dharmapuri, Salem, Tiruvannamalai, Chengalpattu, Villupuram districts and Puducherry.
Day 2 (16.09.2025) Light to moderate rain at a few places with thunderstorm & lightning at one or two places is likely to occur over Tamilnadu, Puducherry & Karaikal area.
Heavy rain is likely to occur at isolated places over Erode, Krishnagiri, Dharmapuri, Tirupattur, Salem, Vellore and Tiruvannamalai districts.
Day 3 (17.09.2025) Light to moderate rain at many places with thunderstorm & lightning at one or two places is likely to occur over Tamilnadu, Puducherry & Karaikal area.
Heavy rain is likely to occur at isolated places over Krishnagiri, Dharmapuri, Salem, Tirupattur, Vellore, Ranipet, Kancheepuram, Chengalpattu, Tiruvannamalai, Kallakurichi, Villupuram, Tiruchirappalli, Theni, Dindigul, Erode, Nilgiris, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Pudukkottai districts, Puducherry and Karaikal area.
Day 4 (18.09.2025) Light to moderate rain at a few places with thunderstorm & lightning at one or two places is likely to occur over Tamilnadu, Puducherry & Karaikal area.
Heavy rain is likely to occur at isolated places over Nilgiris, Erode, Krishnagiri, Dharmapuri, Salem, Vellore, Tirupattur, Ranipet, Tiruvannamalai, Kancheepuram and Chengalpattu districts.
Day 5 (19.09.2025) Light to moderate rain at a few places with thunderstorm & lightning at one or two places is likely to occur over Tamilnadu, Puducherry & Karaikal area.
Heavy rain is likely to occur at isolated places over Tiruvallur, Ranipet, Vellore and Kancheepuram districts.
Day 6 (20.09.2025) Light to moderate rain is likely to occur at isolated places over Tamilnadu, Puducherry & Karaikal area.
Day 7 (21.09.2025) Light to moderate rain is likely to occur at isolated places over Tamilnadu, Puducherry & Karaikal area.
Heavy Rainfall Warning
Day 1 (15.07.2025) Heavy rain is likely to occur at isolated places over Tirupattur, Dharmapuri, Salem, Tiruvannamalai, Chengalpattu, Villupuram districts and Puducherry.
Day 2 (16.07.2025) Heavy rain is likely to occur at isolated places over Erode, Krishnagiri, Dharmapuri, Tirupattur, Salem, Vellore and Tiruvannamalai districts.
Day 3 (17.09.2025) Heavy rain is likely to occur at isolated places over Krishnagiri, Dharmapuri, Salem, Tirupattur, Vellore, Ranipet, Kancheepuram, Chengalpattu, Tiruvannamalai, Kallakurichi, Villupuram, Tiruchirappalli, Theni, Dindigul, Erode, Nilgiris, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Pudukkottai districts, Puducherry and Karaikal area.
Day 4 (18.09.2025) Heavy rain is likely to occur at isolated places over Nilgiris, Erode, Krishnagiri, Dharmapuri, Salem, Vellore, Tirupattur, Ranipet, Tiruvannamalai, Kancheepuram and Chengalpattu districts.
Day 5 (19.09.2025) Heavy rain is likely to occur at isolated places over Tiruvallur, Ranipet, Vellore and Kancheepuram districts.
Thunderstorm Warning
Day 1 (15.09.2025) to Day 5 (19.09.2025) Thunderstorm & lightning is likely to occur at one or two places over Tamilnadu, Puducherry and Karaikal area.
Temperature forecast
Generally no large change in maximum temperatureduring Day 1 (15.09.2025)&Day 2 (16.09.2025) thereafter gradual fall by 2-3°Cat a few pocketsduringDay 3 (17.09.2025)toDay 5 (19.09.2025) over Tamilnadu, Puducherry and Karaikal area.
Maximum Temperature is likely to beabove normal by 2-3°Cat isolated pockets duringDay 1 (15.09.2025) & Day 2 (16.09.2025)and thereafter near normal to slightly below normal during Day 3 (17.09.2025)to Day 5 (19.09.2025) over Tamilnadu, Puducherry and Karaikal area.
