Agni Natchathiram 2025: Tamil Nadu peak summer heat from May 4 to 28
Synopsis
Tamil Nadu's most feared summer stretch — Agni Natchathiram — kicks off on 4 May and runs until 28 May 2025, with interior districts like Vellore, Madurai, and Erode bracing for temperatures up to 43°C. Authorities have issued health advisories as residents face over three weeks of intense heat with no immediate relief in sight.
Key Takeaways
Agni Natchathiram (Kathiri Veyil) begins 4 May 2025 and lasts until 28 May 2025 in Tamil Nadu.
Interior districts including Vellore , Tiruchirappalli , Karur , Erode , and Madurai could see temperatures up to 43 degrees Celsius .
Much of Tamil Nadu is already recording 38–40°C , with heat rising steadily since March .
Coastal Chennai faces lower peak temperatures but high humidity will make conditions oppressive.
Authorities advise avoiding outdoor activity between 11 am and 3 pm ; special caution urged for children, elderly, and those with health conditions.
Pre-monsoon showers are not expected to provide significant relief until later in May.
Tamil Nadu is set to enter its most intense summer phase — known as Agni Natchathiram or Kathiri Veyil — beginning 4 May, with the scorching heat spell expected to persist until 28 May 2025, according to officials. Meteorological authorities have warned of a sharp rise in temperatures across the state during this period, with several districts likely to experience near-heatwave conditions.
What Is Agni Natchathiram
Traditionally regarded as the hottest stretch of the year in Tamil Nadu, the Agni Natchathiram period is characterised by dry atmospheric conditions, clear skies, and intense solar radiation. The absence of significant cloud cover during this phase allows ground temperatures to surge well above seasonal averages, making it a period of acute heat stress for residents across the state.
Temperature Forecast and Affected Districts
Weather officials have cautioned that maximum temperatures in interior districts could climb up to 43 degrees Celsius in the coming days. Many parts of Tamil Nadu are already reporting temperatures in the range of 38–40 degrees Celsius, signalling the onset of a prolonged hot spell. Interior regions including Vellore, Tiruchirappalli, Karur, Erode, and Madurai are expected to bear the brunt of the heat, with higher daytime temperatures and limited cloud cover. Tamil Nadu has been reeling under rising temperatures since March, with a steady increase recorded over the past several weeks.
Coastal areas, including Chennai, may experience relatively lower peak temperatures, but high humidity levels are likely to make conditions oppressive and uncomfortable for residents. The prevailing weather pattern is driven by clear skies and intense solar heating, which typically dominate during this phase before the onset of pre-monsoon showers later in the month. Any significant relief in the immediate term, however, appears unlikely.
Health Advisories Issued
In view of the expected heat conditions, authorities have issued advisories urging the public to take necessary precautions. People are advised to stay well hydrated, avoid stepping out during peak afternoon hours between 11 am and 3 pm, and wear light, loose-fitting clothing. Special care has been recommended for children, the elderly, and those with underlying health conditions, who are more vulnerable to heat-related illnesses. Officials have also cautioned against prolonged outdoor activities during peak hours.
What to Expect Over the Next Three Weeks
With the peak summer phase set to persist for over three weeks, residents across Tamil Nadu have been urged to remain vigilant and plan their daily routines to minimise exposure to extreme heat. Pre-monsoon showers, which typically offer the first meaningful relief, are not expected to arrive in significant strength until later in May. Until then, the combination of high temperatures and dry conditions will continue to define daily life across much of the state.
Point of View
The window for preventive action is narrow. The advisories issued are standard, but what is missing is a district-level heat action plan with measurable outcomes — something that states like Ahmedabad have pioneered after the 2010 heatwave. Tamil Nadu's vulnerability is compounded by the fact that large sections of its workforce — construction labourers, farmers, street vendors — cannot simply avoid the 11 am to 3 pm window. That gap between official advice and ground reality deserves more attention than it typically receives.
NationPress
11 Aug 2026
Frequently Asked Questions
What is Agni Natchathiram and when does it occur in 2025?
Agni Natchathiram, also called Kathiri Veyil, is the traditional peak summer period in Tamil Nadu, known for extreme heat, dry conditions, and intense solar radiation. In 2025, it runs from 4 May to 28 May.
Which districts in Tamil Nadu will be worst affected by the heat?
Interior districts including Vellore, Tiruchirappalli, Karur, Erode, and Madurai are expected to bear the brunt, with temperatures potentially reaching 43 degrees Celsius. Coastal areas like Chennai will face lower peaks but higher humidity.
What precautions have authorities recommended during Agni Natchathiram?
Officials advise residents to stay hydrated, avoid going outdoors between 11 am and 3 pm, and wear light, loose-fitting clothing. Special care is recommended for children, the elderly, and people with underlying health conditions who are more vulnerable to heat-related illness.
Will there be any relief from the heat before May 28?
Significant relief is unlikely in the immediate term. Pre-monsoon showers, which typically ease the heat, are not expected to arrive in meaningful strength until later in May, according to meteorological authorities.
How long has Tamil Nadu been experiencing high temperatures this year?
Tamil Nadu has been experiencing rising temperatures since March 2025, with a steady increase recorded over several weeks. The onset of Agni Natchathiram from 4 May marks the most intense phase of this prolonged summer spell.
