Tamil Nadu, Puducherry rain forecast: Thunderstorms and gusty winds through Tuesday
Synopsis
A weakened low-pressure system over Chhattisgarh is still driving spells of thunder, lightning, and gusty winds across Tamil Nadu, Puducherry, and Karaikal through Tuesday. Chennai could see evening thunderstorms with temperatures touching 35–36°C, while fishermen have been warned off the north Andhra coast and west-central Bay of Bengal.
Key Takeaways
The Regional Meteorological Centre, Chennai issued a multi-day forecast for Tamil Nadu , Puducherry , and Karaikal on 26 September 2026 .
A deep depression weakened into a low-pressure area over southern Chhattisgarh by 8:30 am on 25 September .
Gusty winds of 40 to 50 kmph are possible in Chennai , Kancheepuram , Tiruvallur , Vellore , and other districts through Tuesday.
Chennai temperatures are likely between 35–36°C (max) and 27–28°C (min), running 2–3°C above normal .
Fishermen advised to avoid the north Andhra Pradesh coast and west-central Bay of Bengal on Saturday; winds may gust to 60 kmph .
Light to moderate rain at a few places expected on 30 September and 1 October .
Parts of Tamil Nadu, Puducherry, and Karaikal are likely to receive light to moderate rain accompanied by thunderstorms and gusty winds through Tuesday, 30 September 2026, the Regional Meteorological Centre (RMC) in Chennai said on Saturday, 26 September. The forecast follows the weakening of a deep depression over southern interior Odisha and adjoining Chhattisgarh.
Weather System Background
The deep depression weakened early on Friday over southern interior Odisha and adjoining Chhattisgarh. By 8:30 am on 25 September, the system had downgraded to a low-pressure area, moving north-northwestwards over southern Chhattisgarh and adjoining southern interior Odisha. While no longer a deep depression, the residual moisture continues to influence weather across Tamil Nadu and the union territories of Puducherry and Karaikal.
Day-by-Day Rain Forecast
On Saturday, 26 September, one or two places in the Western Ghats districts and in Chennai, Kancheepuram, Chengalpattu, Tiruvallur, Vellore, and Ranipet may receive light to moderate rain with thunder, lightning, and winds reaching 40 to 50 kmph. Isolated light rain is likely elsewhere across Tamil Nadu, Puducherry, and Karaikal.
On Sunday, moderate thunderstorms are forecast at isolated places in the Western Ghats districts, while other parts of Tamil Nadu, Puducherry, and Karaikal may see light to moderate rain with thunder, lightning, and gusts of 40 to 50 kmph.
The Monday forecast covers thunderstorms across the Western Ghats districts, Chennai, and northern and central districts — including Kancheepuram, Chengalpattu, Tiruvallur, Villupuram, Tirupattur, Vellore, Ranipet, Namakkal, Karur, Erode, Tiruchirappalli, Ariyalur, Perambalur, Pudukkottai, and Sivaganga. Isolated light rain is possible in Puducherry and Karaikal as well. Similar conditions are expected to persist through Tuesday.
Light to moderate rain at a few places is expected on 30 September and 1 October.
Temperature Outlook for Chennai
Maximum temperatures across the region are unlikely to change substantially through 29 September, though a slight rise remains possible. Daytime temperatures may run two to three degrees Celsius above normal. In Chennai, partly cloudy skies are expected on Saturday, with light to moderate thunderstorms possible in parts of the city by evening. The maximum temperature is likely to reach 35 to 36 degrees Celsius, while the minimum may hover around 27 to 28 degrees Celsius.
Fishermen Advisory and Coastal Waters
The RMC has advised fishermen to avoid venturing into the north Andhra Pradesh coast and adjoining west-central Bay of Bengal on Saturday, where winds may reach 40 to 50 kmph, gusting up to 60 kmph. Notably, no warning has been issued for Tamil Nadu coastal waters or the Arabian Sea for the period 26 to 29 September.
Point of View
Not a crisis alert, but the breadth of the warning — spanning nearly a dozen named districts, two union territories, and a coastal fishermen advisory — underscores how the remnant circulation of a weakened system can still command wide weather impact. The slight above-normal temperature reading is worth watching: a combination of humid heat and afternoon thunderstorms raises heat-stress risk in urban areas like Chennai, a dimension that standard weather bulletins rarely flag explicitly. With the Northeast Monsoon onset approaching, this low-pressure residue could complicate forecast models for the season's opening weeks.
NationPress
26 Sept 2026
Frequently Asked Questions
Which districts in Tamil Nadu are likely to receive heavy rain this week?
Districts including Chennai, Kancheepuram, Chengalpattu, Tiruvallur, Vellore, Ranipet, Namakkal, Karur, Erode, Tiruchirappalli, Ariyalur, Perambalur, Pudukkottai, and Sivaganga are named in the forecast for thunderstorms and gusty winds through Tuesday. Western Ghats districts are also on alert for moderate thunderstorms.
What weather system is causing the rain in Tamil Nadu?
A deep depression over southern interior Odisha and Chhattisgarh weakened into a low-pressure area by 25 September. Its residual moisture is being drawn southward, triggering spells of thunder, lightning, and gusty winds across Tamil Nadu, Puducherry, and Karaikal.
Is there a warning for fishermen in Tamil Nadu?
The Regional Meteorological Centre has not issued a warning for Tamil Nadu coastal waters or the Arabian Sea for 26–29 September. However, fishermen have been specifically advised to avoid the north Andhra Pradesh coast and adjoining west-central Bay of Bengal on Saturday, where winds may reach 40–50 kmph and gust up to 60 kmph.
What will Chennai's weather be like this weekend?
Chennai is expected to see partly cloudy skies on Saturday with light to moderate thunderstorms possible in the evening. Maximum temperatures are likely to be in the range of 35–36 degrees Celsius, while the minimum may hover around 27–28 degrees Celsius.
When will the rain stop in Tamil Nadu?
According to the Regional Meteorological Centre, thunderstorms and gusty winds are forecast through Tuesday. Light to moderate rain at a few places is also expected on 30 September and 1 October, suggesting intermittent wet spells continuing into early October.
