France's national public health agency Sante Publique France published its official summer 2025 heat review on 26 February 2026. The numbers are stark: over 5,700 deaths attributable to heat, more than 24,000 emergency care visits, and the third hottest summer since 1900. For field medical teams, firefighters, event medics, and occupational health professionals, this report is the clearest possible signal that heat stroke preparedness cannot wait.

The numbers: what summer 2025 actually looked like

According to the Sante Publique France national bulletin, summer 2025 ranked as the third hottest summer in France since 1900, with average temperatures running 1.9°C above the 1991-2020 baseline. France experienced four heat waves, including two major ones: June 19 to July 6, and August 8 to 19.

Key figures from the monitoring period:

The first heat wave alone — June 19 to July 6 — caused an estimated 480 excess deaths across 60 departments.

The detail most reports miss: working-age adults are affected too

The dominant narrative around heat mortality focuses on elderly, isolated individuals. People aged 75 and older did represent 53% of emergency visits. But the August 13, 2025 surveillance bulletin revealed something critical for field teams: increases in hyperthermia and heat stroke cases were observed across all age groups, with a particularly marked rise among the 15-to-44-year-old cohort — the working-age, physically active population.

These are precisely the people at risk of exertional heat stroke (EHS):

EHS is clinically distinct from classic heat stroke. It can occur even in moderate ambient temperatures when physical exertion is intense and sustained. It progresses rapidly. Its treatment is known. Its mortality, when cooling is delayed, is high.

The long-term trend: nearly 40,000 deaths since 2017

The Sante Publique France report places 2025 in a clear trajectory: since 2017, nearly 40,000 deaths have been attributable to heat, with 11,700 during heat wave episodes specifically. This figure should appear in every corporate heat plan, every emergency team summer preparation protocol, and every equipment procurement justification. Heat mortality is not a once-in-a-decade anomaly — it is a recurrent, documented, worsening trend.

What the data demands from field medical teams in 2026

For fire services and emergency medical units

The increase in heat-related interventions is structural. The logistical question is direct: is cold water immersion equipment deployable in under 30 seconds at every operational position exposed to EHS risk?

For event medical directors

The 2026 trail, marathon, and triathlon season is underway under conditions that mirror summer 2025. Cold water immersion must be in the base medical kit — not a backup option. International consensus from the IOC, World Athletics, and ACSM is unambiguous: whole-body cold water immersion is the gold standard treatment for exertional heat stroke. No alternative method comes close in cooling speed.

For EHS and occupational health professionals

The French regulatory landscape changed on July 1, 2025, when Decree n°2025-482 introduced mandatory heat risk assessment obligations for employers. The Sante Publique France data provides the epidemiological justification for why those obligations exist — and why field-level response capability, including rapid cooling equipment, is their operational translation.

Cool first, transport second: the protocol the data demands

Every minute without cooling worsens outcomes. The "cool first, transport second" protocol starts with one question: is immersion equipment present and ready on site?

Sources

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