The United Kingdom has recorded its hottest day of the year so far, with temperatures surpassing 32C, as parts of the country entered a heatwave. On June 18, 2025, a temperature of 32.2C was recorded at Kew and Heathrow, London, breaking the previous 2025 record of 29.4C set in Suffolk on June 13. The intense heatwave has affected large swaths of the UK, with many areas experiencing unusually high temperatures for this time of year.
Suffolk became the first location in the UK to officially enter a heatwave on Thursday after temperatures exceeded 27C for the third consecutive day. As temperatures soared, concerns about the impact of the extreme heat on public health and safety also grew, with health authorities issuing amber heat health alerts across all of England. The UK Health Security Agency (UKHSA) warned that the country’s health and social care systems would face increased pressures due to the heatwave, and authorities urged caution during the ongoing heatwave.
Amber heat health alerts have been in effect across England until 09:00 BST on Monday, with the UKHSA specifically highlighting the strain that high temperatures can have on health services. These alerts indicate that heat is likely to cause difficulties in managing medicines, may strain the healthcare workforce, and could lead to internal temperatures in care settings exceeding the recommended thresholds. The risk of heat-related illnesses, particularly among vulnerable populations such as those aged 65 or older or those with underlying health conditions, remains elevated.
The rising temperatures are expected to build toward a high of 33C on Saturday, with central and eastern England experiencing the peak of the heat. Weather experts anticipate widespread temperatures ranging from 27C to 30C on Thursday across East Wales, the Midlands, and East and South East England. A few locations around Greater London and the Home Counties are also expected to reach the low 30s, joining Kew in breaking the 30C threshold. Elsewhere, temperatures will range from 23C to 27C, though coastal areas will remain cooler, with temperatures hovering around 20C.
A heatwave is officially declared by the UK Met Office when temperatures exceed a set threshold for at least three consecutive days. The thresholds vary depending on the region: 25C in the north and west, 28C in parts of eastern England, and 27C in Suffolk. The current heatwave was officially declared in Suffolk after temperatures reached above the 27C mark in the village of Santon Downham for three days straight.
The heat is not only affecting the general public but has also taken its toll on major events in the country. At Royal Ascot, which takes place in Berkshire just outside London, race organizers confirmed that dozens of attendees required medical assistance due to heat-related illnesses. The intense heat wave, along with the large crowd attending the event, led to an increased number of medical emergencies, highlighting the dangers of prolonged exposure to such high temperatures.
As temperatures continue to climb, the UKHSA has also issued health advice to ensure that residents can safely cope with the heat. They urge the public to stay hydrated, avoid direct sunlight, and check in on vulnerable individuals, particularly the elderly and those with health conditions. Organizations like the British Heart Foundation (BHF) have also warned that high temperatures could put extra strain on the heart, particularly for those with existing heart conditions. Similarly, Age UK has encouraged people to check in on older relatives, friends, and neighbors, as they are especially vulnerable to heat-related illnesses.
With the heatwave expected to last through the weekend, regional fire services have issued warnings about water safety. Strong currents, underwater hazards, and the risk of cold water shock remain high, especially for young people who might be tempted to cool off in rivers or lakes. Pam Oparaocha, assistant commissioner for prevention and protection at the London Fire Brigade, stressed the importance of safety near waterways, urging people to familiarize themselves with lifesaving equipment like throwlines.
Although the heatwave is expected to peak over the weekend, a shift in wind direction to a westerly on Sunday is expected to bring relief from the oppressive temperatures. However, while temperatures may drop in the western and northern parts of the UK, eastern areas will still experience mid-20s temperatures.
This heatwave is part of a broader pattern of rising global temperatures, with climate scientists warning that extreme weather events, such as heatwaves, will continue to become more frequent and intense due to global warming. Scientists have pointed out that there are as little as three years left to limit global warming to 1.5C—an ambitious target set by the 2015 Paris Agreement. This target aims to limit global temperature rises to prevent some of the worst impacts of climate change, including the increasing frequency of heatwaves, severe storms, and flooding.
Last year marked the hottest year on record globally, with temperatures consistently surpassing the 1.5C target set by the Paris Agreement. The Met Office reports that heatwaves are now 30 times more likely to occur than they were before the industrial revolution. Scientists predict that by the 2050s, heatwaves could occur every other year as greenhouse gas concentrations continue to rise, leading to more intense and prolonged hot weather across the world.
The current heatwave in the UK is a stark reminder of how global climate change is affecting local weather patterns. The record-breaking temperatures in London and other parts of the country show how quickly weather patterns can shift, leaving the population exposed to new dangers. The likelihood of heatwaves becoming more frequent and severe in the coming decades makes it imperative for countries to invest in climate change mitigation and adaptation strategies to protect public health and safety.
As the UK endures this heatwave, residents are advised to stay informed about changing weather conditions and follow safety guidelines issued by local authorities. While the scorching heat may provide an opportunity for beach trips and outdoor activities, it also presents significant risks to vulnerable populations, making caution and preparedness critical.
While the UK navigates through this current heatwave, many are also considering the broader implications of global warming on future generations. The UK government, local authorities, and citizens must work together to take actions that reduce carbon emissions and prepare for more extreme weather events. At the same time, individuals can contribute by staying hydrated, avoiding unnecessary heat exposure, and helping protect those most at risk, particularly the elderly, children, and those with underlying health conditions.
This heatwave is not just a weather event; it is a reflection of the climate crisis that is unfolding worldwide. As temperatures rise, the need for action has never been clearer. For now, the UK is experiencing a temporary but intense heatwave, but the lessons learned from this extreme weather event will be vital in preparing for the heatwaves of the future, which are projected to become even more frequent and intense as climate change continues to shape our world.