The United Kingdom is bracing for its third heatwave this summer, with temperatures expected to climb to 33C (91.4F) starting this weekend. The prolonged high temperatures have led to millions of people in Hampshire and the Isle of Wight facing a new hosepipe ban, while an ice cream van in Slough caught fire in the heat.
The heat is not confined to southern England; temperatures are forecast to reach 30C (86F) as far north as South Yorkshire. Yellow heat health alerts have been issued for several regions, including the East Midlands, West Midlands, East of England, London, South East England, and South West England, warning of increased health risks, particularly for vulnerable individuals.
Record Heat and Consecutive Bans
The heatwave is predicted to be significantly longer than the record-breaking heatwave in June, potentially lasting into mid-July. This is the first time Southern Water has implemented a temporary use restriction in consecutive years. Similarly, South East Water customers in Kent began a hosepipe ban on July 4, which is expected to continue until autumn.
Southern Water cited critically low levels in the River Test, a primary water source for Hampshire and the Isle of Wight, as the reason for the restrictions. Water levels have dropped faster than anticipated, prompting calls for the construction of the UK's first new reservoir in 30 years.
Extreme Heat's Wider Impacts
The intense heat has had unusual consequences, including an ice cream van catching fire on Salisbury Avenue in Slough. Firefighters responded to the blaze, which caused the van to become a blackened shell. While no one was seriously injured, some individuals were advised to seek hospital treatment for minor injuries.
The heat has also contributed to a significant marine heatwave around the UK. Sea temperatures have reached levels typically expected in August, averaging 2C warmer than usual, with some offshore areas experiencing anomalies of +4-5C. This persistent warmth, with little opportunity for the ocean to cool between heat spikes, has intensified marine heatwave conditions, particularly along the Welsh and English coasts.
Experts warn that these warmer sea conditions reduce night-time cooling on land, sustaining warmth in coastal areas. The marine heatwave poses risks to marine ecosystems, including seagrass and kelp habitats, and can lead to mass-mortality events for some species. The warmer waters may also attract non-native species and alter the distribution of commercially important fish and shellfish populations.