Tamil Nadu rain forecast 5 Sep: Thunderstorms likely, Chennai evening showers
Synopsis
A convergence of an upper-air cyclonic circulation, an active trough, and a merged low-pressure system is set to bring thunderstorms and light to moderate rain across Tamil Nadu on 5 September. Chennai residents should brace for possible evening showers, while interior districts face temperatures running two to four degrees above normal — a reminder that the monsoon still has plenty of energy left this season.
Key Takeaways
Light to moderate rain with thunderstorms forecast across Tamil Nadu on 5 September , particularly over Western Ghats districts and Madurai, Sivaganga, Ramanathapuram, Virudhunagar .
Chennai expected to remain partly cloudy with possible evening or night showers ; maximum temperature 35–36°C , minimum 26–27°C .
An upper-air cyclonic circulation at 7.6 km altitude and a trough from south interior Karnataka to the Gulf of Mannar are the primary weather drivers.
Rainfall likely to stay light at isolated places from 6 to 8 September , with a slight increase forecast on 9 and 10 September .
No warning issued for fishermen along the Tamil Nadu coast, Bay of Bengal, or Arabian Sea for 5–8 September .
Interior district temperatures may run two to four degrees Celsius above normal during the period.
Several parts of Tamil Nadu are likely to receive light to moderate rain accompanied by thunderstorms on Saturday, 5 September, according to the Regional Meteorological Centre (RMC). The forecast is particularly active over the Western Ghats districts and parts of southern Tamil Nadu, with Chennai expected to see possible evening or night showers.
Weather Systems Driving the Forecast
The RMC attributes the wet spell to a combination of atmospheric triggers. An upper-air cyclonic circulation persists over coastal Tamil Nadu and the adjoining southwest Bay of Bengal at an altitude of approximately 7.6 km. A trough extending from south interior Karnataka across Tamil Nadu to the Gulf of Mannar at around 0.9 km above mean sea level is also active.
A weak low-pressure circulation that had formed in the lower atmosphere off the Tamil Nadu coast has since merged with the prevailing weather system, further increasing the likelihood of scattered rainfall across the region.
District-Level Rainfall Outlook
On 5 September, light to moderate rain with thunderstorms is forecast at one or two places over the Western Ghats districts and the districts of Madurai, Sivaganga, Ramanathapuram, and Virudhunagar. Isolated locations elsewhere in Tamil Nadu, as well as Puducherry and Karaikal, may also receive light rain with thunderstorms.
From 6 to 8 September, light rain is expected at isolated places across Tamil Nadu, Puducherry, and Karaikal. Rainfall activity is forecast to pick up slightly on 9 and 10 September, when light to moderate showers are anticipated over the Western Ghats districts, northern Tamil Nadu, Puducherry, and Karaikal.
Chennai Weather on Saturday
In Chennai and its suburbs, the sky is expected to remain partly cloudy through the day. Light to moderate rain with thunderstorms is possible in some areas during the evening or night. The maximum temperature in the city is likely to hover between 35 and 36 degrees Celsius, while the minimum is expected to range between 26 and 27 degrees Celsius.
Temperature Trends and Fishermen Advisory
The weather department has indicated no significant change in maximum temperatures over coastal Tamil Nadu, Puducherry, and Karaikal between 5 and 8 September. However, interior districts could see temperatures rise marginally — some areas may record readings two to four degrees Celsius above normal, while coastal temperatures are expected to remain close to seasonal levels.
Notably, no warning has been issued for fishermen along the Tamil Nadu coast, the Bay of Bengal, or the Arabian Sea for the period of 5 to 8 September, indicating sea conditions remain broadly safe for fishing activity. Rainfall activity is expected to remain a recurring feature through the second week of September as the monsoon systems sustain their influence over the region.
Point of View
But the clustering of three simultaneous weather systems — a cyclonic circulation, an active trough, and a merged low-pressure area — deserves attention. While no red or orange alert has been issued, the combination historically amplifies localised rainfall quickly. The absence of a fishermen's warning is reassuring, but interior Tamil Nadu's above-normal temperature projection alongside rainfall activity points to high humidity stress for agricultural communities already navigating an uneven monsoon season. Media coverage tends to focus on Chennai; the more vulnerable impact zone this weekend is likely the Western Ghats fringe and Ramanathapuram district.
NationPress
5 Sept 2026
Frequently Asked Questions
Will it rain in Chennai on 5 September 2025?
Yes, Chennai is likely to see light to moderate rain accompanied by thunderstorms during the evening or night of 5 September, according to the Regional Meteorological Centre. The sky will remain partly cloudy through the day, with temperatures between 35 and 36 degrees Celsius.
Which districts in Tamil Nadu are most likely to receive heavy rain on 5 September?
The Western Ghats districts and the southern districts of Madurai, Sivaganga, Ramanathapuram, and Virudhunagar are most likely to receive light to moderate rain with thunderstorms on 5 September. Isolated locations elsewhere in Tamil Nadu and in Puducherry and Karaikal may also see light rain.
What weather systems are causing rain in Tamil Nadu?
Three overlapping systems are responsible: an upper-air cyclonic circulation over coastal Tamil Nadu and the southwest Bay of Bengal at 7.6 km altitude, a trough running from south interior Karnataka to the Gulf of Mannar, and a weak low-pressure circulation that has merged with the prevailing system off the Tamil Nadu coast.
Is there any warning for fishermen along the Tamil Nadu coast?
No warning has been issued for fishermen along the Tamil Nadu coast, the Bay of Bengal, or the Arabian Sea for the period of 5 to 8 September, indicating sea conditions are broadly safe for fishing activity during this window.
What is the rainfall outlook for Tamil Nadu from 6 to 10 September?
Light rain is expected at isolated places across Tamil Nadu, Puducherry, and Karaikal from 6 to 8 September. Rainfall activity is forecast to increase slightly on 9 and 10 September, with light to moderate showers anticipated over Western Ghats districts, northern Tamil Nadu, Puducherry, and Karaikal.
