Britain is preparing for its third summer heatwave, with temperatures expected to climb above 30 degrees Celsius (86 degrees Fahrenheit) for ten days in a row. The UK Health Security Agency has upgraded heat health alerts to amber for the Midlands, eastern, and southern parts of England, warning of potential significant impacts on health and social care services.
The alert is in effect from Wednesday evening, July 8, through Sunday evening, July 12. Forecasters anticipate heat intensifying mid-week, with temperatures potentially reaching 34C (93.2F) in parts of England, particularly in London and the southeast. While not expected to reach the record-breaking highs of 37.7C (100F) seen in late June, the prolonged period of high temperatures raises concerns.
Northern regions of the UK have received yellow heat-health alerts, indicating a risk to life. Parts of southeast England have already met official heatwave conditions, defined as three consecutive days with maximum temperatures meeting or exceeding a regional threshold, such as 28C (82.4F) in London.
Schools have taken precautionary measures, canceling sports days and allowing students to wear PE kits to mitigate risks during the heat. Health officials predict a rise in deaths among the elderly and those with pre-existing health conditions, but also caution that younger age groups are at risk. The increase in water-related incidents, including cold-water shock and drowning, is also a concern. At least 11 people died in water incidents during the June heatwave, following 17 fatalities in the May heatwave.
The heatwave's impact extends to critical infrastructure. One of the UK's fastest AI supercomputers, Dawn, owned by the University of Cambridge and used for cancer and climate research, shut down on June 27 due to technical issues during the hot weather. While full cooling capacity has been restored, the downtime paused research jobs.
Water companies are implementing restrictions to conserve supply. Southern Water has enacted a hosepipe ban for one million customers in Hampshire and the Isle of Wight, starting July 10. South East Water's ban for 850,000 customers in Kent, which began on July 3, followed record demand. Anglian Water has requested customers voluntarily conserve water and refrain from using hosepipes without implementing an official ban. These restrictions follow the hottest spring and June on record for England and the UK, with previous record-breaking temperatures in May and June.