A series of heatwaves leads Britain to record its hottest summer

Britain experienced its hottest summer on record in 2026, with successive heatwaves contributing to a mean average temperature of 16.5 Celsius (61.7 Fahrenheit). This surpassed the previous record set in 2025 and marks the fifth hottest summer occurring since 2003. The Met Office stated that human-caused climate change made such a hot summer 130 times more likely. The extreme heat led to destructive wildfires, water restrictions, and an estimated 2,877 deaths in England associated with earlier heatwaves. While England, Wales, and Northern Ireland set new summer temperature records, Scotland experienced its sixth warmest summer. Drought conditions persist in Wales and most of England.

Experts warn that strong El Niño-associated winds this autumn could cause significant tree mortality in England. A prolonged period of extreme heat and drought this summer has weakened trees, making them brittle and less flexible. This stress, exacerbated by climate change, has caused many trees to enter "early autumn" prematurely. The Met Office forecasts a strong El Niño event with increased rainfall and storms for the UK. This combination of brittle trees and high winds, potentially coupled with root damage from dry weather followed by heavy rain, could lead to widespread tree failure, with some species like silver birch, beech, and oak at risk of local extinction. Ancient oaks are particularly vulnerable, and the full impact may not be evident for several years.

The summer of 2026 was the UK's hottest on record, with an average mean temperature of 16.5C, according to provisional data from the Met Office. This record-breaking heatwave, which saw temperatures peak at 38.1C in London, was made approximately 130 times more likely by human-induced climate change, scientists stated. The extreme heat also contributed to widespread drought and wildfires across Europe, with England experiencing its driest July on record. Met Office projections indicate that UK summers will continue to become hotter and drier due to climate change. The summer's conditions align with expectations for an average summer under 3C of global warming.