Thinking · Evidence

15,800 projected heat deaths this season: the arm no Indian heat plan funds is chronic care.

Abhijith Magal · 26 September 2026 · 8 min read

The El Nino heat deaths India can expect this season now carry a number. The University of Chicago's Climate Impact Lab, modelling heat mortality across more than 24,000 regions worldwide, projects 451,000 additional deaths from extreme heat globally between June 2026 and February 2027, compared with an average year. For the six months from September to February, India's projection is 15,800 additional deaths, with an uncertainty band of 1,600 either way, the fourth-highest national toll behind Nigeria, Indonesia and Sudan.

The report, titled 451,000 at Risk: Where Action Can Save Lives During the Super El Nino, expects global land temperatures about 1.2 degrees Celsius above normal through the coming months and 44 per cent more extremely hot days than a typical year. The lab calls this El Nino a postcard from the future: a preview of temperatures that become ordinary within a few decades. Michael Greenstone, the lab's co-founder, framed the purpose plainly: the point of publishing now is that emergency actions can be taken now in the places the map names.

Two readings of that table are available. The first treats 15,800 as a forecast to be checked next March. The second notices that 7,400 of it sits in December to February, which has not happened yet, and asks what moves it. The researchers' own answer, in the report and in Greenstone's follow-up interviews, is a short list: heat warnings, cooling centres, hydration stations, protection for outdoor workers, and strengthened healthcare.

Four of the five are funded. One is not.

Indian heat action plans, where they exist and function, cover the first four. Warnings go out through IMD and state systems. Cities open cooling spaces and water points. Labour departments issue work-hour advisories. The record of implementation is uneven, which I covered in the heat season and healthcare operations, but the categories are at least on the page.

The fifth is not. Heat does not mostly kill healthy people caught outdoors. It kills through the body's existing weak points: a heart already compromised, kidneys already strained, a respiratory condition already managed on daily medicine. WHO's new heat guidance, released on 30 September, says this directly: extreme heat worsens chronic disease. The mortality in the lab's model concentrates in older people and the chronically ill, which means the programme that moves India's 7,400 is, to a large extent, a chronic-care programme wearing a heat-season schedule.

This is also where the money question answers itself. A municipal heat plan cannot fund per-patient outreach; it holds no patient lists and carries no mandate for it. Health programmes have the lists. A pharma CSR programme running a hypertension or diabetes cohort in a heat-exposed district already holds the single most valuable asset a heat response can own: the names of the people the season will test. Adding a forecast trigger to that cohort, refill-before-the-wave, a call, a check on storage since ambient heat degrades the medicines themselves, costs a fraction of the programme and produces its own outcome measure: treatment days maintained through hot spells. The programme design behind this is the Continuity Cohort Method, published on Zenodo at doi.org/10.5281/zenodo.22861246. For workforces, the same logic runs through the employer's duty of care.

The trigger side of this, which forecast moves which action for whom, is its own discipline, and a report published the same week as the lab's makes the case that the decision must be specified before the data; I take that up in the decision before the heatwave.

One limit, and it is a real one. These are modelled projections against a 1996-2025 baseline, not recorded deaths, and the total moves with the strength of this El Nino; the lab says it will update as the event develops. The country ranking and the 1,600-death band are the report's own. India's recorded heat mortality is known to undercount, so the projection and any eventual official count will not be comparable; that mismatch is the subject of a separate piece. Use the figure as a planning signal with its uncertainty attached, not as a forecastable fact.

Common questions

How many heat deaths does the Climate Impact Lab project for India?

15,800 additional heat-related deaths between September 2026 and February 2027, with an uncertainty range of plus or minus 1,600, the fourth-highest national projection behind Nigeria, Indonesia and Sudan. Globally the lab projects 451,000 additional deaths from June 2026 to February 2027 against a typical year.

Are these projections or recorded deaths?

Projections. The lab layers seasonal temperature forecasts onto mortality relationships modelled across more than 24,000 regions, compared against a 1996-2025 baseline. The figures will be updated as the El Nino develops, and could rise if it extends into 2027, when India and Pakistan enter their summer months.

What actions does the report say would save lives?

Heat warnings, cooling centres, hydration stations, protection for outdoor workers and strengthened healthcare, concentrated in the regions the projection maps. The lab's stated purpose is to let decision makers direct emergency measures to the highest-risk areas before the deaths occur.

Why should chronic disease programmes care about a heat forecast?

Heat mortality concentrates in older people and those with cardiac, renal and respiratory conditions, and WHO's September 2026 heat guidance states that extreme heat worsens chronic disease. A programme holding a chronic-patient list can act on a forecast directly: refills brought forward, outreach calls, and monitored care routes through hot spells.

Abhijith Magal

Founder, Syntropy Earth. Nine years across two global pharmaceutical multinationals in patient access and commercial roles, with health-equity work alongside the WHO-Foundation and UNICEF. He works on climate-access: where climate disruption breaks the link between patients and care.

This page reads published projections. It is not clinical guidance; heat illness and chronic disease management follow national guidelines and the advice of a qualified doctor.

Last updated: 3 October 2026