Heatwave alert: 8 Tamil Nadu districts to see above-normal temps till July 30
Synopsis
Tamil Nadu is caught between two extremes: eight interior districts bracing for temperatures 2–4°C above normal until 30 July, while the Western Ghats receive welcome rainfall relief. The IMD's dual advisory underscores how unevenly the monsoon is playing out across the state this season.
Key Takeaways
The RMC Chennai has forecast temperatures 2°C to 4°C above normal in eight Tamil Nadu districts until 30 July .
Districts affected: Vellore, Erode, Karur, Dindigul, Madurai, Virudhunagar, Thoothukudi and Tirunelveli .
Light to moderate rainfall expected over the Western Ghats and parts of North Coastal Tamil Nadu, Puducherry and Karaikal through 30 July .
Chennai to see partly cloudy skies with possible light evening or night showers; no heavy rain forecast.
The IMD has advised residents to avoid afternoon sun, stay hydrated, and monitor weather advisories.
The Regional Meteorological Centre (RMC), Chennai, has forecast daytime temperatures running 2°C to 4°C above normal across eight interior districts of Tamil Nadu until 30 July, even as light to moderate rainfall is expected over the Western Ghats during the same period. The dual weather pattern reflects the uneven monsoon distribution currently gripping the state.
Districts Under Heat Alert
The India Meteorological Department (IMD) has flagged above-normal maximum temperatures at several places in Vellore, Erode, Karur, Dindigul, Madurai, Virudhunagar, Thoothukudi and Tirunelveli districts. Residents in these areas have been advised to avoid prolonged sun exposure during peak afternoon hours, stay well hydrated, and take precautions against heat-related illnesses.
Meteorologists noted that the elevated temperatures are likely to persist through 30 July before any moderation sets in, contingent on evolving weather systems over the Bay of Bengal and surrounding regions.
Rainfall Outlook for Western Ghats and Coastal Areas
In contrast to the scorching interior, the hilly areas of the Western Ghats are expected to receive light to moderate rainfall through 30 July. The precipitation is anticipated to ease prevailing heat conditions and support agricultural activity in the hill regions.
The RMC has also forecast light to moderate rain at one or two places over North Coastal Tamil Nadu, Puducherry and Karaikal from Tuesday through 30 July. Widespread rainfall, however, is not anticipated — isolated showers are likely only under favourable atmospheric conditions.
Chennai Weather Forecast
For Chennai, the RMC has predicted partly cloudy skies over the coming days. Light rain is possible at certain parts of the city, particularly during evening or nighttime hours, though no heavy rainfall has been forecast. Daytime conditions are expected to remain warm and humid, with temperatures hovering close to seasonal norms.
Health Advisory and Public Precautions
The IMD has urged residents in the eight heat-affected districts to remain updated with the latest weather advisories. Key recommendations include avoiding outdoor activity during peak afternoon heat, maintaining adequate hydration, and seeking shade or shelter where possible. Residents in areas likely to receive rainfall have been separately advised to stay alert to local weather updates and potential changes in conditions.
This comes amid a broader pattern of warm, humid weather across Tamil Nadu despite intermittent rainfall in some regions — a sign of the uneven monsoon progress that has characterised the season so far. How quickly Bay of Bengal weather systems develop will determine whether temperatures moderate before or after 30 July.
Point of View
And what does that mean for vulnerable populations and kharif crop stress? The IMD advisory is necessary but insufficient without district-level health infrastructure on standby.
NationPress
27 Jul 2026
Frequently Asked Questions
Which Tamil Nadu districts are under heatwave alert until July 30?
Eight interior districts — Vellore, Erode, Karur, Dindigul, Madurai, Virudhunagar, Thoothukudi and Tirunelveli — are expected to record maximum temperatures 2°C to 4°C above normal until 30 July, according to the RMC Chennai.
Will it rain in Tamil Nadu during the heatwave period?
Yes, but unevenly. Light to moderate rainfall is forecast over the Western Ghats and isolated parts of North Coastal Tamil Nadu, Puducherry and Karaikal through 30 July. Widespread rain is not expected across the state.
What is the weather forecast for Chennai?
Chennai is expected to have partly cloudy skies with the possibility of light rain during evening or nighttime hours. No heavy rainfall has been forecast, and daytime conditions will remain warm and humid near seasonal norms.
What precautions has the IMD advised for heat-affected districts?
The IMD has advised residents to avoid prolonged exposure to the sun during peak afternoon hours, stay well hydrated, and take precautions against heat-related illnesses. Residents in rain-likely areas should also monitor local weather updates closely.
When will temperatures moderate in Tamil Nadu's interior districts?
Meteorologists expect elevated temperatures to persist through 30 July, after which some moderation is possible depending on the development of weather systems over the Bay of Bengal.
