As the UK continues to swelter under an unprecedented heatwave, many regions are now approaching two weeks of extreme temperatures. Southern England has reported an unbroken streak of 13 days surpassing heatwave criteria, with Merryfield in Somerset registering a notable 30.6°C (87.1°F) on Thursday. This marks the longest consecutive period of temperatures at or above 30°C since 2006, with 12 days recorded in this category across the nation.
Extended Heat Paves the Way for Record-Breaking Conditions
The heatwave gripping the UK has not only persisted but intensified, with areas like Bournemouth and Heathrow maintaining temperatures over 26°C and 28°C respectively for nearly 14 days. While slightly cooler air is expected to move in from the north this weekend, a few locations may still experience prolonged heatwave conditions. However, it is unlikely that the longstanding record of 16 consecutive days above 30°C, set in 1976, will be surpassed.
A combination of climatic changes and favourable weather patterns has contributed to this extraordinary heat. The UK’s climate has warmed by an average of 1.33°C since the period of 1961-1990, according to the Met Office. More strikingly, the hottest days have escalated by 4.5°C in Greater London alone. This summer’s atmospheric conditions have been particularly conducive for heat generation, with the jet stream positioned unusually far north, allowing high pressure to dominate and warm southern air to flood into the region. The result has been the formation of a “heat dome,” where air sinks, compresses, and heats up, leading to prolonged sunshine and elevated ground temperatures.
A Summer of Records and Comparisons
This year is shaping up to be one for the record books, having already seen monthly temperature records shattered in both May and June by over two degrees. As we stand midway through July, we have already witnessed 12 days above the 30°C mark, in stark contrast to last year’s third heatwave, which only saw a few days exceeding this threshold.
While parts of Scotland and Northern Ireland have also experienced heatwave conditions, the intensity and duration have not matched those in the south. Comparisons with the historic summer of 1976 are frequent, but this year has seen higher extreme temperatures and a greater number of “very hot days.” Notably, some regions, such as Wisley in Surrey, have experienced an astonishing 30 days without rainfall, contributing to widespread dryness despite some areas in western Scotland observing above-average precipitation.
The intensity of this heatwave is particularly remarkable, with six days exceeding 35°C recorded this year. This marks the first time such temperatures have been documented over three consecutive months—May, June, and July.
The Changing Face of Heatwaves
The Met Office has issued a stark warning that heatwaves in the UK are becoming more frequent, longer-lasting, and increasingly intense. Their latest climate report highlights that the number of days exceeding 30°C has quadrupled in areas like Greater London. Furthermore, heatwaves are now occurring outside traditional summer months, exemplified by a record-breaking autumn heatwave in September 2023.
The season kicked off with an unprecedented heatwave in late May, which saw the UK record its highest daytime temperature for that month and the first “tropical night” of 2026, with overnight temperatures not dipping below 21.4°C.
A Shift in Weather Patterns
As we look ahead, a shift in weather patterns is expected. This weekend, northerly winds will introduce a slight reduction in temperatures for many regions, with Scotland, Northern Ireland, and parts of north-east England likely to see increased cloud cover and temperatures in the low 20s. Meanwhile, much of England and Wales can anticipate continued sunny, dry conditions, with temperatures ranging between 24°C and 27°C, and some southern areas possibly reaching 28°C or 29°C.
Long-term forecasts suggest that high pressure will persist through the remainder of July, maintaining above-average temperatures, albeit not as extreme as those seen in recent days. There is a possibility of showers later in the month, particularly in the north. As we transition into August, models indicate a potential return to more variable weather, though above-average temperatures are expected to continue.
Why it Matters
This ongoing heatwave serves as a stark reminder of the increasing volatility of the UK’s climate. The rising frequency and intensity of heatwaves are indicative of broader changes in our environment, with significant implications for agriculture, water supply, and public health. As the nation grapples with these extreme weather events, the urgency for sustainable practices and climate resilience measures has never been clearer. The heat is not just a temporary discomfort; it signals a profound shift that demands our attention and action.