The UK has experienced a remarkable run of hot weather so far this year, with three distinct heatwaves affecting different parts of the country since late spring.
The latest spell has proven particularly persistent, raising questions not only about how long the heat will last, but also about the wider impacts that extended periods of hot weather can have on people, landscapes and the environment.
While many people welcome warm summer conditions, prolonged heat affects far more than just day-to-day comfort. From human health and vegetation to wildfire conditions and sea temperatures, the influences of repeated hot spells can be felt across a wide range of sectors.
Why this summer has been so notable
This year has seen three separate heatwaves develop since late spring, with the current July event lasting longer than the previous two. Although temperatures have not reached the exceptional peaks seen during some previous UK summers, the longevity of the warm weather has been a defining feature of the season so far.
The sustained warmth has also arrived despite parts of the UK experiencing wet weather earlier in the season. That contrast between wetter periods and subsequent heat has created a number of important environmental impacts, particularly when combined with strong sunshine and continued dry conditions.
Heat is about more than temperature
One of the key lessons from recent heatwaves is that temperature alone does not tell the full story. Humidity can significantly influence how conditions feel and how the human body responds to hot weather. During the June heatwave, high humidity levels combined with exceptionally warm air to create particularly oppressive conditions across parts of England and Wales.
Humidity affects the body's ability to cool itself through sweating. As moisture levels in the atmosphere increase, evaporation becomes less efficient, making it harder for people to regulate body temperature. This is one reason why humid heat can often feel more uncomfortable than a dry heat, even when air temperatures are similar.
Research highlighted in the Met Office Deep Dive examined the health impacts associated with recent heatwaves, demonstrating that prolonged hot weather can have significant consequences for public health. The findings underline why heat remains one of the most serious weather-related hazards affecting the UK.
The impact on landscapes and vegetation
Another consequence of repeated heatwaves is the way they transform the landscape. Even where rainfall has occurred earlier in the season, prolonged periods of warmth can rapidly dry soils and vegetation. Higher temperatures accelerate evaporation, removing moisture from the ground much more quickly.
Satellite imagery highlighted during the Deep Dive showed notable changes across parts of the UK over a relatively short period of time, illustrating how quickly landscapes can dry out when exposed to repeated hot spells.
The UK's prolonged hot, sunny and dry weather is visible from space 🛰️
— Met Office (@metoffice) July 14, 2026
Comparing satellite images from late May and now, much of the landscape has turned from green to brown
Farmers and gardeners are feeling the strain, with wildfire risk elevated as a third heatwave continues pic.twitter.com/wPmgHRgg8R
These dry conditions can increase pressures on vegetation and agriculture while also creating an environment where fires can spread more easily once ignited.
READ MORE: When will it rain?
Why wildfire conditions are elevated
The Met Office Fire Severity Index has indicated high or very high severity levels across large parts of England and Wales. Importantly, this does not represent the likelihood of a wildfire starting. Instead, it reflects how severe a fire could become if one were to occur.
A combination of dry ground, warm temperatures, low humidity and periods of stronger winds can create conditions that allow fires to spread more rapidly and become more difficult to control. These ingredients have been present across parts of the UK in recent weeks.
The effects of these conditions have also been seen elsewhere in Europe, where hot, dry and windy weather has increased wildfire concerns in several countries.
A marine heatwave around UK waters
The impacts of recent weather are not confined to land. Waters surrounding the UK have also been experiencing marine heatwave conditions, with sea surface temperatures remaining well above average across many coastal areas.
Warmer seas can have important consequences for marine ecosystems. These include changes to habitats, disruption to food chains and the potential expansion of species into areas where they have not traditionally been common. Marine heatwaves can also influence wider ecosystem processes and coastal environments.
Sea temperatures can also play a role in future weather patterns. Warmer waters may contribute to milder nights, enhanced humidity and increased moisture availability if wetter weather eventually develops later in the season.
How long will the heat last?
There are signs that temperatures will gradually ease through the second half of the week as slightly fresher air begins to move in from the east and north-east. Conditions are expected to become less intense, although temperatures are still likely to remain above average for many areas.
By the weekend, many places will feel less hot than they have done recently, though high pressure is expected to remain close to the UK. This means settled weather is likely to continue, with little sign of widespread rainfall in the short term. While isolated thunderstorms may develop at times, significant rainfall appears limited for now.
As a result, the story for the coming days remains largely unchanged: temperatures easing gradually, but plenty of dry weather continuing. After a summer already shaped by repeated heatwaves, the broader impacts on health, landscapes and surrounding seas will continue to be closely monitored in the weeks ahead.
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