The United Kingdom has already endured two significant heatwaves this summer, shattering long-standing temperature records and prompting concerns about a season of extreme heat. This pattern, with two heatwaves occurring within the last two months, has not been seen since 1911. While the current June heatwave is expected to subside over the weekend, forecasters indicate a heightened likelihood of further heatwaves and their associated impacts through the remainder of the summer.

The summer's weather has been characterized by dramatic shifts. May saw a "heat dome" settle over the UK, bringing dry, sunny, and very warm conditions, culminating in a new May record temperature of 35.1C. This was followed by a sharp contrast in early June, with low pressure from the Atlantic bringing wet and much cooler weather, delivering the entire month's average rainfall in the first half. However, weather patterns shifted again dramatically, leading to another intense heatwave that broke the all-time June temperature record.

Seasonal forecasts issued on June 1 suggested a higher-than-normal chance of hotter weather for June, a prediction that has proven accurate. The Met Office issued its first red extreme heat warning since 2021 for parts of south-east Wales and southern England, leading to school closures and strain on the transport network.

Looking ahead, forecasters from MeteoGroup, who provide data to BBC Weather, anticipate "significant bursts" of heat for the UK and across Europe throughout July and August. The Met Office's three-month outlook indicates above-average temperatures are expected for both months, increasing the probability of heatwaves and their impacts.

The increased likelihood of hotter summers is consistent with the broader trend of human-induced climate change, which is raising baseline temperatures. This shift is making heatwaves hotter, more frequent, and longer-lasting. Met Office scientists have noted an accelerating pace in the increasing likelihood of extreme temperatures in the UK.

In 2022, the UK recorded its first temperature above 40C, with Coningsby, Lincolnshire reaching 40.3C. Projections from the Met Office suggest that if global warming continues at its current rate, mid-forties temperatures could become a serious possibility for the UK by 2050.

Analysis by World Weather Attribution (WWA) has indicated that the extreme heat experienced across Western Europe in June would have been virtually impossible just a few decades ago, further underscoring the impact of climate change on extreme weather events.

Dr. Theodore Keeping, an extreme weather and wildfire researcher at Imperial College London, has emphasized the direct link between climate change and the worsening of heatwaves, noting the increasing frequency and intensity of such events. Unresolved questions remain about the long-term adaptation strategies needed to cope with increasingly extreme summer weather.