Tamil Nadu thunderstorms, moderate rain forecast today, 2 September
Synopsis
A weak atmospheric circulation off Tamil Nadu's coast is set to bring thunderstorms and moderate rain to Chennai and over a dozen districts on 2 September, with interior temperatures expected to climb two to four degrees above normal by mid-week. Fishermen have been warned off the Gulf of Mannar and Comorin Sea as squally winds up to 65 kmph are forecast.
Key Takeaways
The Regional Meteorological Centre has forecast moderate rain with thunderstorms across Tamil Nadu , including Chennai , on 2 September .
A weak atmospheric circulation over Tamil Nadu's coastal areas is the primary trigger for the rainfall.
Over 16 districts — including Salem, Tiruchi, Thanjavur, and Cuddalore — are under a moderate rain alert.
Interior Tamil Nadu temperatures may rise two to four degrees Celsius between 2 and 5 September .
Fishermen advised against venturing into the Gulf of Mannar and Comorin Sea on Wednesday and Thursday; winds may gust to 65 kmph .
Western Ghats districts are expected to receive light to moderate rain from 5 to 7 September .
The Regional Meteorological Centre has forecast moderate rain accompanied by thunderstorms across several parts of Tamil Nadu, including Chennai, on Wednesday, 2 September. A weak atmospheric circulation over the coastal areas of Tamil Nadu is driving the rainfall activity.
Districts Under Moderate Rain Alert
Moderate rain with thunderstorms is likely at one or two places in districts along the Western Ghats. Similar weather has been forecast at isolated places in Chennai, Chengalpattu, Tiruvallur, Kancheepuram, Ranipet, Tiruvannamalai, Villupuram, Kallakurichi, Cuddalore, Tiruchi, Ariyalur, Perambalur, Salem, Namakkal, Tiruvarur, and Thanjavur. The remaining parts of the state and the Karaikal region may see light rain with thunderstorms at a few places.
Three-Day Outlook
On Thursday, light to moderate rain with thunderstorms is likely at one or two places in Tiruvannamalai, Villupuram, Madurai, Sivaganga, and Pudukkottai districts, besides Puducherry. Isolated light rain may also occur across the rest of Tamil Nadu and the Karaikal region. On Friday, moderate rain is forecast at isolated places in the Western Ghats districts, with light showers possible elsewhere in Tamil Nadu, Puducherry, and Karaikal. From 5 to 7 September, the Western Ghats districts may receive light to moderate rain, while isolated light rain is forecast across remaining areas.
Temperature Rise in Interior Tamil Nadu
Maximum temperatures in interior Tamil Nadu are expected to rise by two to four degrees Celsius between 2 and 5 September. A few interior locations could record temperatures two to four degrees above normal. No significant temperature change is expected along the Tamil Nadu coast or in Puducherry and the Karaikal region.
Chennai Weather and Fishermen Advisory
Chennai is expected to have a partly cloudy sky on Wednesday, with light to moderate rain likely in some parts of the city during the evening or night. The maximum temperature is likely to remain between 35 and 36 degrees Celsius and the minimum between 26 and 27 degrees Celsius. Fishermen have been advised not to venture into waters off the south Tamil Nadu coast, the Gulf of Mannar, and the adjoining Comorin Sea on Wednesday and Thursday. Squally winds reaching 45 to 55 kmph, occasionally gusting to 65 kmph, are expected in these waters. Strong winds are also likely over the southern parts of the southwest Bay of Bengal and the Andaman Sea. No warning has been issued for the Arabian Sea from 2 to 5 September.
Point of View
But the fishermen advisory for the Gulf of Mannar and Comorin Sea deserves attention — squally winds gusting to 65 kmph represent a genuine safety risk for coastal livelihoods. The projected two-to-four-degree rise in interior temperatures alongside active rainfall is also an unusual combination that could affect agricultural activity in districts like Salem and Namakkal, where kharif harvests are underway. Weather coverage in India too often stops at city-level forecasts; the district-by-district breakdown here is precisely what farmers and fisherfolk need, and mainstream outlets rarely surface it prominently.
NationPress
2 Sept 2026
Frequently Asked Questions
Which parts of Tamil Nadu will receive rain on 2 September?
Moderate rain with thunderstorms is forecast for over 16 districts including Chennai, Chengalpattu, Tiruvallur, Salem, Tiruchi, Thanjavur, and Cuddalore, as well as districts along the Western Ghats. The rest of Tamil Nadu and the Karaikal region may see light rain with thunderstorms at isolated places.
What is causing the rain in Tamil Nadu today?
A weak atmospheric circulation prevailing over the coastal areas of Tamil Nadu is the primary trigger for the rainfall and thunderstorm activity, according to the Regional Meteorological Centre.
Is there a fishermen warning issued for Tamil Nadu?
Yes. Fishermen have been advised not to venture into waters off the south Tamil Nadu coast, the Gulf of Mannar, and the Comorin Sea on Wednesday and Thursday. Squally winds of 45 to 55 kmph, gusting up to 65 kmph, are expected in these areas.
What will Chennai's weather be like on 2 September?
Chennai is expected to have a partly cloudy sky with light to moderate rain likely during the evening or night. The maximum temperature is forecast between 35 and 36 degrees Celsius and the minimum between 26 and 27 degrees Celsius.
How long will the rain last in Tamil Nadu?
Rain activity is expected to continue through the week. Western Ghats districts are forecast to receive light to moderate rain from 5 to 7 September, while isolated light rain is expected across the rest of Tamil Nadu during the same period.
