Heavy rain, thunderstorms forecast for 7 Tamil Nadu districts on Monday
Synopsis
The RMC in Chennai has flagged heavy rain and thunderstorms for seven Tamil Nadu districts on Monday, driven by an atmospheric circulation over the Comorin Sea and a trough reaching the Arabian Sea. With Cauvery delta districts already recording up to 9 cm of rain in 24 hours, the latest spell marks a sustained bout of active weather rather than a one-off shower.
Key Takeaways
The RMC Chennai has forecast heavy rainfall with thunderstorms and strong winds in 7 Tamil Nadu districts on 9 November 2026 .
Districts on alert: Thanjavur , Tiruvarur , Mayiladuthurai , Nagapattinam , Pudukkottai , Sivaganga , and Ramanathapuram .
The Karaikal region of Puducherry is also under a similar weather forecast.
Parimunai and Maduravoyal in Chennai recorded the highest rainfall of 9 cm in the preceding 24 hours .
The weather is driven by an atmospheric circulation over the Comorin Sea and a trough extending to the east-central Arabian Sea .
Residents in affected districts have been advised to remain cautious during thunderstorms and gusty winds.
The Regional Meteorological Centre (RMC) in Chennai has forecast heavy rainfall accompanied by thunderstorms, lightning, and strong winds across seven districts of Tamil Nadu on Monday, 9 November 2026, as atmospheric disturbances continue to drive unsettled weather conditions across the state.
Districts on Alert
According to the weather department, the districts of Thanjavur, Tiruvarur, Mayiladuthurai, Nagapattinam, Pudukkottai, Sivaganga, and Ramanathapuram are likely to experience heavy rainfall at isolated places. The Karaikal region of Puducherry has also been placed under a similar forecast.
Thunderstorms accompanied by strong winds and rainfall are additionally forecast for the Nilgiris, Coimbatore, Tiruppur, Virudhunagar, Dindigul, Madurai, Theni, Thoothukudi, Tenkasi, Tirunelveli, and Kanniyakumari districts. Light rainfall is expected at a few places across the remaining parts of Tamil Nadu and Puducherry.
What Is Driving the Weather
The RMC attributed the prevailing conditions to an atmospheric circulation over the Comorin Sea and adjoining areas, combined with a trough extending from southern Tamil Nadu to the east-central Arabian Sea. These overlapping systems are generating widespread atmospheric instability, feeding the cycle of thunderstorms, lightning, and gusty winds across multiple parts of the state.
Notably, this forecast comes on the back of significant rainfall already recorded over the previous 24 hours, indicating a sustained period of active weather rather than an isolated event.
Chennai and Previous Rainfall Data
Chennai and its surrounding areas are expected to remain under generally cloudy skies throughout the day, with light rain or thundershowers likely at isolated locations. The city witnessed considerable rainfall in the preceding 24-hour period.
According to rainfall data released by the weather department, Parimunai and Maduravoyal in Chennai recorded the highest rainfall of 9 cm during the 24 hours ending at 8:30 am on Sunday. Nungambakkam and Tondiarpet in Chennai, along with Kayalpattinam in Thoothukudi district, recorded approximately 8 cm of rainfall during the same period.
Coastal and Delta Regions Most Exposed
The RMC indicated that rainfall activity is likely to remain concentrated in the Cauvery delta districts and adjoining coastal areas, with intermittent thunderstorms expected elsewhere. The continuing spell has placed several districts under prolonged unstable conditions, with the coastal and southern regions facing the highest probability of further showers.
Residents in the affected districts have been advised to exercise caution during thunderstorms and strong winds. With atmospheric triggers still in place, the weather department's outlook suggests that unsettled conditions could persist across Tamil Nadu into the coming days.
Frequently Asked Questions
Which districts in Tamil Nadu are under heavy rain alert on 9 November?
The seven districts under a heavy rainfall alert are Thanjavur, Tiruvarur, Mayiladuthurai, Nagapattinam, Pudukkottai, Sivaganga, and Ramanathapuram. The Karaikal region of Puducherry is also forecast to receive similar weather conditions.
What is causing the heavy rain and thunderstorms in Tamil Nadu?
The RMC has attributed the weather to an atmospheric circulation over the Comorin Sea and adjoining areas, combined with a trough extending from southern Tamil Nadu to the east-central Arabian Sea. Together, these systems are generating widespread atmospheric instability across the state.
How much rainfall did Chennai record in the past 24 hours?
Parimunai and Maduravoyal in Chennai recorded the highest rainfall of 9 cm during the 24 hours ending at 8:30 am on Sunday. Nungambakkam, Tondiarpet, and Kayalpattinam in Thoothukudi district each recorded approximately 8 cm in the same period.
Are other parts of Tamil Nadu also expected to receive rain?
Yes. Thunderstorms and strong winds are forecast for Nilgiris, Coimbatore, Tiruppur, Virudhunagar, Dindigul, Madurai, Theni, Thoothukudi, Tenkasi, Tirunelveli, and Kanniyakumari. Light rainfall is likely at a few places across the rest of Tamil Nadu and Puducherry.
What precautions have authorities advised for residents?
The weather department has advised residents in districts facing heavy rainfall to remain cautious during thunderstorms and strong winds. With atmospheric triggers still active, the RMC expects unsettled conditions to persist in coastal and southern regions.
