UK braces for record May heat as heat health alerts issued

Dangerous heat swept in early over England as officials issued a yellow heat-health alert for the East Midlands, East of England, London, West Midlands and South East, running from 9am on Friday 22 May until 5pm on Wednesday 27 May. Forecasters said temperatures could climb to 33C, with Monday expected to be the hottest day of the spell and the long-standing May record of 32.8C, set at Camden Square in London in 1922, in reach.

The alert matters because it is not just a record-chasing heat story. The UK Health Security Agency and the Met Office have built the Heat-Health Alert service to signal risk to health and social care services, and the system now uses yellow, amber and red categories to reflect both the likelihood of harm and how serious that harm may be. It has been in place since 2004 and, since summer 2023, has shifted to impact-based warning. The core season runs from 1 June to 30 September, but an extraordinary alert is issued when hot weather arrives outside that window, which is exactly what happened here.

That early timing raises the stakes for hospitals, schools, employers and care homes because the people most exposed are those already vulnerable to heat stress. Officials warned of minor impacts on health and social care services, including a greater risk to life for vulnerable people. The Met Office says the service is aimed at health and social care professionals and others responsible for reducing harm from hot weather, and that stakeholders should take the usual public health actions set out in the Adverse Weather and Health Plan. For people living with dementia, the Alzheimer’s Society said the risk is higher in warm conditions and advised keeping drinking water close by, choosing light, airy clothing, staying out of direct sun between 11am and 3pm, taking cool showers and keeping blinds closed.

The warning lands against a sobering public-health backdrop. Office for National Statistics analysis estimated that 4,507 deaths in England were associated with the hottest days in 2022, and said heat-related mortality has shown signs of increasing in recent years. That makes the current spell more significant than the headline temperature alone: it is another test of whether health services, schools, workplaces and care settings can spot risk early enough to prevent avoidable harm.