London is expecting a second heatwave this month with temperatures forecast to rise between 31.1 °C and 36 °C [1, 2].
These extreme conditions pose significant risks to public health, particularly for vulnerable populations. The UK Health Security Agency issued a heat health alert to mitigate the risk of heat-related illnesses and water-related deaths during the spike in temperature [1].
The Met Office said forecasts indicate that the heat will intensify on Tuesday [1, 2]. This follows a record-breaking week where temperatures in the city reached as high as 35 °C [1]. Earlier this month, the city recorded 30.5 °C on what was then the hottest day of 2026 [2].
Recent readings have shown the temperature hitting 31.1 °C [1]. The upcoming weather pattern is expected to push these figures higher, with some forecasts suggesting London could swelter in 36 °C [2].
Health officials are monitoring the situation closely as the city prepares for the second wave of intense heat. The agency's alert serves as a trigger for local health services to implement contingency plans, ensuring that hospitals and care homes can manage the increased demand for emergency services.
Public health guidance typically emphasizes hydration and avoiding direct sunlight during peak hours. The combination of urban heat island effects and these high temperatures increases the likelihood of heatstroke, and dehydration, across the metropolitan area [1].
“London is expecting a second heatwave this month with temperatures forecast to rise between 31.1 °C and 36 °C.”
The occurrence of two distinct heatwaves in a single May suggests an unusual volatility in early-season weather patterns for the UK. Because London's infrastructure is not traditionally designed for sustained extreme heat, these frequent spikes increase the burden on public health systems and highlight the city's vulnerability to urban overheating.
