Analysis from climate-focused think tank Verdant indicates that multiple heatwaves across the UK during the summer months have resulted in approximately £4.4bn in reduced economic output by late July. The figure builds on an earlier assessment covering June’s unseasonably high temperatures, which had estimated a £2.36bn economic impact. The estimate accounts for direct productivity losses as workers become less efficient during extreme heat conditions and as infrastructure and equipment requires shutdown to prevent damage.
The UK is currently experiencing another period of extreme temperatures this week, marked by an amber weather warning issued by the Met Office for England. This latest heat event follows three previous significant heatwaves in May, June, and July. Weather forecasters have indicated the UK may record its hottest summer on record. Nearly three-quarters of England has been officially declared to be in drought conditions as a result of the repeated temperature spikes.
Verdant’s analysis relies on cross-European research from insurance company Allianz, which suggests that worker productivity declines by approximately 3% per hour for each degree above 30 degrees Celsius. The think tank’s estimates exclude indirect costs such as wildfire suppression expenses and increased electricity consumption from cooling devices. The organization has identified London and the southeast as likely experiencing the most severe economic effects due to the highest temperatures recorded in those regions.
The research aligns with findings from the Grantham Research Institute at the London School of Economics, which documented over £1bn in output losses during June alone. A survey of 2,000 individuals found that approximately 3.6% did not work at all during the final week of June due to extreme heat, while 87% reported health impacts including sleep disruption and dizziness. If current trends continue, Verdant projects annual economic costs could exceed £25bn by 2030.
Union leaders and government officials have called for new protections, including maximum working temperature thresholds and compensation mechanisms for workers forced to reduce hours. Verdant has also recommended urban redesign initiatives to create additional green spaces in cities and towns.
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