Key Takeaways
- The UK recorded its highest-ever May temperature for two days in a row, reaching 35 °C (95 °F) at Heathrow and Kew Gardens on Tuesday, surpassing the previous May record of 32.8 °C set in 1922.
- A yellow weather warning for thunderstorms was issued for much of England, with the potential for up to 30 mm of rain in an hour, while amber health warnings remained in place across several regions until Thursday.
- The country experienced “tropical nights” (overnight lows ≥ 20 °C) and heat‑wave conditions were already met in eight areas by Sunday night, with more locations expected to qualify after the bank‑holiday period.
- May 2024 showed an unprecedented temperature range of 32.9 °C, exceeding the previous record set in May 1944, indicating a shift toward more extreme variability.
- Attribution studies suggest that breaking the May record is now about three times more likely due to human‑induced greenhouse‑gas emissions, turning a once‑in‑a‑century event into a roughly one‑in‑33‑year occurrence.
- Despite the heat, cooler easterly winds are forecast to lower temperatures in eastern England by about 10 °C mid‑week, while the overall weather remains largely dry with sunny spells.
- The heat contributed to tragic incidents, including two teenage deaths in reservoirs and a grass fire near Arthur’s Seat in Edinburgh that prompted smoke‑related safety advice.
Record‑Breaking May Temperatures
The United Kingdom experienced its highest‑ever May temperature for the second consecutive day, with thermometers climbing to 35 °C (95 °F) at Heathrow Airport and Kew Gardens in London, according to the Met Office. This figure eclipses the previous May record of 32.8 °C, which had stood unchanged since 1922. The reading follows a provisional high of 34.8 °C recorded the day before at Kew Gardens, marking the hottest meteorological spring temperature on record for the UK.
Thunderstorm and Health Warnings
In response to the extreme heat, the Met Office issued a yellow weather warning for thunderstorms across much of England, effective from 3 p.m. to 10 p.m. on Tuesday. Forecasters warned that isolated storms could bring lightning, hail, and gusty winds, affecting regions stretching from Bath and Reading to Lincoln and Sheffield, with the possibility of up to 30 mm of rainfall in a single hour in some localities. Concurrently, the UK Health Security Agency (UKHSA) extended amber health alerts for the south‑west, south‑east, London, East and West Midlands, and the west of England until 5 p.m. on Thursday, while yellow alerts persisted for the north‑west and north‑east. The amber alert for the south‑west was upgraded from yellow, reflecting heightened concern over heat‑related health risks.
Heat‑Wave Criteria and Current Status
A heat‑wave in the UK is defined as three or more consecutive days where temperatures meet or exceed a location‑specific threshold. For London and areas north toward Cambridgeshire, the threshold stands at 28 °C. By Sunday night, eight sites had already satisfied this criterion: Heathrow, Kew Gardens, and Northolt in London; Benson in Oxfordshire; Brooms Barn and Santon Downham in Suffolk; and High Beech and Writtle in Essex. Met Office senior meteorologist Becky Mitchell noted that additional locations were likely to reach heat‑wave status after the bank‑holiday weather, although the final data had not yet been released.
Temperature Extremes and Monthly Range
May 2024 exhibited an extraordinary temperature spread. Dr. Stephen Burt of the University of Reading’s Department of Meteorology highlighted that the month’s minimum temperature dipped to –0.1 °C (an air frost) on 12 May, while the maximum reached 32.8 °C in Reading less than two weeks later. This yields a monthly range of 32.9 °C, surpassing the previous record of 32.8 °C set in May 1944. Such a wide swing underscores increasing volatility in the UK’s spring climate.
Climate Change Attribution
A prior Met Office attribution study found that breaking the May temperature record is now roughly three times more probable in the current climate, which includes anthropogenic greenhouse‑gas emissions, than it would have been in a natural, emissions‑free climate. Consequently, an event once considered a one‑in‑a‑century occurrence has become a approximately one‑in‑33‑year event. This quantitative shift illustrates how human‑driven warming is altering the likelihood of extreme heat in the UK.
Contrasting Conditions Elsewhere
While southern England sweltered, other parts of the British Isles experienced markedly cooler weather. Scotland recorded lows of –5 °C the previous week, with daytime highs generally hovering between 14 °C and 15 °C. This stark contrast highlights the heterogeneous nature of UK weather patterns, where regional disparities can be substantial even during nationally notable heat episodes.
Impacts: Tragic Incidents and Fire Risk
The intense heat contributed to several serious incidents over the bank‑holiday weekend. Police reported the death of a 13‑year‑old boy who encountered difficulties in a West Yorkshire reservoir on Monday; he was rescued from the water and later pronounced dead in hospital. In South Yorkshire, the body of a second teenage boy was discovered early Tuesday after he had last been seen entering water at a Rotherham park the previous day. Additionally, firefighters battled a grass fire near Arthur’s Seat in Edinburgh overnight, with temperatures in the city reaching 25 °C. Smoke plumes prompted local authorities to advise residents to keep windows and doors shut as a precaution.
Forecast and Outlook
Looking ahead, the Met Office anticipates a gradual decline in temperatures from the middle of the week, although conditions are expected to remain largely dry with intermittent sunny spells. Many areas should continue to experience highs in the upper 20 °C range. However, a developing brisk easterly wind is projected to bring cooler air to eastern England, potentially reducing temperatures there by about 10 °C relative to the west. Despite the impending cooling, the recent heat spike has already left a notable imprint on health, safety, and environmental indicators across the nation.