Key Takeaways
- The UK experienced its hottest year on record in 2025, with temperatures driven by rising atmospheric carbon pollution.
- Spring and summer 2025 were the warmest ever recorded; England also saw its driest spring in a century.
- The number of days exceeding 30 °C in the UK now matches the extraordinarily hot year of 1976, and the frequency of such extreme heat is accelerating.
- Over the past decade, the average hottest day in southeast England and the East Midlands is 4.5 °C warmer than the 1961‑1990 baseline, while Greater London has seen more than a four‑fold increase in days over 30 °C and nights over 18 °C.
- Warmer air holds more moisture, leading to a >20 % rise in the very wettest days and a 5 % increase in rainfall intensity since the 1961‑1990 period, even as droughts intensify in hot, dry summers.
- Spring 2025 rainfall in England and Wales fell below half the 1991‑2020 average, and river flows from March to August were the second lowest since 1961.
- Persistent hot, dry conditions have fueled wildfires, prompting fire services to warn of a developing “firewave.”
- The May‑June 2026 heatwaves were linked to approximately 2,700 excess deaths in England and Wales, underscoring the growing human toll of climate extremes.
- Experts stress that today’s climate anomalies are becoming the new normal and will continue to worsen unless greenhouse‑gas emissions are curtailed.
Temperature Trends and Record Heat
The UK’s climatic extremes are becoming increasingly normal, a recent report has found, with 2025 recorded as the hottest year since instrumental measurements began in 1884. The annual State of the UK Climate report attributes this surge to carbon pollution that has “clogged the atmosphere,” pushing temperatures to unprecedented heights. Notably, the country experienced its warmest spring and summer on record last year, while England endured its driest spring in a century. These observations come amid a series of deadly heatwaves sweeping Europe; the Met Office reported that, by early 2026, the UK had already logged as many days above 30 °C (86 °F) as during the exceptionally hot year of 1976.
Shifting Perceptions of Extremes
Mike Kendon, a scientist at the National Climate Information Centre and lead author of the report, warned that what society once labelled “extreme” is now being viewed as ordinary. “We are seeing unprecedented changes continuing … and every year adds to this body of evidence,” Kendon stated. The report, published in the International Journal of Climatology, highlights that the last four years rank among the top five hottest on record, with climate breakdown raising the baseline for dangerous extremes.
Regional Warming Patterns
Geographically, the warming is not uniform. In a corridor stretching from Kent in the southeast to Lincolnshire in the East Midlands, the average hottest day of the year is now 4.5 °C (8.1 °F) warmer than the 1961‑1990 average. Greater London shows an even starker shift: the number of days exceeding 30 °C and nights above 18 °C has more than quadrupled over the same period. Meanwhile, traditionally cooler northern regions are now experiencing temperatures that London enjoyed only a few decades ago, illustrating a northward shift of climatic zones.
Historical Context of Average Temperatures
Kendon illustrated the magnitude of change by noting that in the 1980s, an annual average temperature of 11 °C was virtually unknown across the UK. By 2025, almost one‑fifth of the country’s land surface had reached that value. This shift underscores how rapidly the thermal baseline is moving, turning what were once rare warm spells into regular occurrences.
Rainfall Intensity and Moisture Capacity
Warmer air can hold roughly 7 % more moisture for each degree Celsius of warming, a physical principle that amplifies both heavy rainfall and drought risk. The report found that the number of the very wettest days has risen by more than 20 % since the 1961‑1990 period, while overall rainfall intensity has increased by 5 %. Consequently, while the UK is becoming wetter on average, the distribution of precipitation is becoming more erratic, intensifying flood hazards during extreme events.
Contrasting Drought Trends
Despite the overall increase in rainfall intensity, hot and dry summers are exacerbating drought conditions. In spring 2025, most of England and Wales received less than half of the average rainfall recorded for the same period in 1991‑2020. River flow from March to August 2025 was the second lowest on record in a dataset extending back to 1961, signalling severe water stress for ecosystems, agriculture, and water supply systems.
Impacts on Society and Infrastructure
Liz Bentley, head of the Royal Meteorological Society, emphasized that the public’s experience of climate change is mediated through weather extremes. “Climate change has been described by scientists for many years but is now increasingly being felt by the UK population in their own homes and communities,” she noted. The resulting strain on infrastructure—such as transport networks, housing, and energy systems—is growing, as many of these assets were designed for a climate that no longer matches recent observations.
Wildfire Risk and the “Firewave” Phenomenon
Persistent hot and dry weather has created ideal conditions for wildfires. Fire services have struggled to contain blazes in recent days, with experts warning that the country is in the grip of a “firewave.” The third heatwave of 2026, forecast to peak at 33 °C on Wednesday, is expected to be longer but milder than the late‑June episode that overwhelmed hospitals, disrupted travel, and forced school closures. A separate analysis linked the May‑June heatwaves to roughly 2,700 excess deaths in England and Wales, highlighting the direct human cost of rising temperatures.
Future Outlook and Call to Action
Kendon concluded with a sobering reminder: the current trajectory of climatic change is not static. “A final point, if you find this sobering enough, is these changes are set to continue. We’re not saying that where we are now is where we’re going to stay.” Without substantial reductions in greenhouse‑gas emissions, the UK can expect further temperature rises, more frequent and intense heatwaves, amplified rainfall extremes, and deeper droughts. Adapting infrastructure, revising planning standards, and enhancing public health preparedness will be essential to mitigate the growing risks posed by a climate that is rapidly moving beyond historical norms.