
All NHS ambulance services in England experienced exceptionally high demand during a record-breaking heatwave in June, according to data released through freedom-of-information requests. Temperatures exceeded 37 degrees Celsius in parts of the country, prompting authorities to issue only the second-ever “red” extreme heat warning, which indicates significant risk to life even for healthy populations.
Four of the 10 ambulance services, including London’s, responded to unprecedented numbers of life-threatening emergencies on at least one day during the 23-27 June period. Two additional services in the south-west and east reported their highest total call volumes on record. The five-day period from 23-27 June dominated the rankings of busiest days across all services, with this period particularly overrepresented in southern and eastern regions where temperatures approached 38 degrees Celsius.
On 26 June, the busiest day during the heatwave, ambulance services across England responded to 4,084 life-threatening emergencies compared to a typical summer average of around 2,500 daily incidents. Analysis indicates that demand during the heatwave exceeded levels seen during traditionally busy winter periods in previous years and even surpassed peak demand during the Covid-19 pandemic for many services.
Extreme heat increases risks of multiple life-threatening conditions, including heart disease and respiratory problems, with certain populations particularly vulnerable. Officials noted that older people, young children, and pregnant individuals face heightened danger during prolonged high temperatures. Beyond the heatwave, 2026 has tracked as a record year for overall ambulance demand, reflecting longer-term increases driven by factors including aging populations and rising prevalence of complex health conditions.
The data underscores how heat-related emergencies are increasingly matching or exceeding cold-weather-related demands, a pattern observed across the healthcare system. Ambulance workers also faced additional pressures from prolonged heat exposure and back-to-back callouts amid reports of faulty or absent air conditioning in some vehicles.
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