Key Takeaways
- The Met Office forecasts a May temperature of 35 °C in parts of England on Monday, which would shatter the existing May record (32.8 °C) by 2.2 °C—an unprecedented jump for the time of year.
- Overnight lows have already hit a May‑record 19.4 °C at Kenley, Greater London, narrowly avoiding a “tropical night” (≥20 °C); two such nights are predicted for Monday and Tuesday.
- Sunday marked the UK’s hottest May day in at least 79 years, with Kew Gardens recording 32.3 °C, and several localities (Santon Downham, Heathrow, Kew Gardens, Northolt, Benson, Brooms Barn, High Beach, Writtle) have officially met heat‑wave criteria.
- Scientists attribute the increasing intensity and frequency of such events to the climate crisis driven by fossil‑fuel carbon pollution, noting that 30 °C temperatures—once rare even in midsummer—are becoming commonplace.
- Europe is the fastest‑warming continent, and the UK’s typical peak‑summer heat (late July‑early August) is expected to surpass current May extremes later this season.
Overview of the Forecast
The Met Office has issued an alert predicting that temperatures could reach 35 °C in parts of England on Monday. This forecast is described as “unprecedented” for May, because the current national May record stands at 32.8 °C, set in previous years. If the prediction materialises, the new high would exceed the old record by a full 2.2 °C, a margin far larger than the typical incremental breakthroughs of tenths of a degree that usually characterize record‑breaking events.
Record‑breaking Potential
A Met Office spokesperson emphasized that today (Monday) would become the hottest May day in the UK’s temperature records. Historically, monthly maximum records are broken by only small fractions; the last such occurrence was in January 2024, when the record rose by 1.6 °C. The July 2022 extreme of 40.3 °C also surpassed its predecessor by 1.6 °C. Consequently, a 35 °C reading in May would represent a dramatic deviation, underscoring the unusual nature of this heatwave.
Overnight Temperatures and Tropical Nights
On Sunday night, an overnight minimum of 19.4 °C was recorded at Kenley in Greater London, establishing a new May‑time low‑temperature record. This value is just below the threshold for a “tropical night,” defined as a night when temperatures do not fall below 20 °C. The Met Office forecasts two tropical nights for Monday and Tuesday, indicating that the heat will persist well after sunset, which can exacerbate discomfort and health risks, particularly for vulnerable populations.
Historical Context of May Heat
Sunday’s peak of 32.3 °C at Kew Gardens marked the UK’s hottest May day in at least 79 years, illustrating how exceptional the current conditions are relative to recent history. Such high temperatures in May were previously rare, reflecting a shift in the seasonal temperature distribution. The fact that a single day approached the July record highlights the accelerating pace of warming.
Areas Meeting Heat‑wave Criteria
Several localities have officially satisfied the UK’s heat‑wave definition (typically three or more consecutive days with daily maximum temperatures meeting or exceeding a location‑specific threshold). The first to meet the criteria was Santon Downham in Suffolk on Sunday. Additional areas now classified as under heat‑wave conditions include Heathrow, Kew Gardens, and Northolt in London; Benson in Oxfordshire; Brooms Barn in Suffolk; and High Beach and Writtle in Essex. This geographic spread demonstrates that the heatwave is not isolated but affects a broad swath of southern and central England.
Climate Crisis Link
Scientists attribute the growing intensity and likelihood of heatwaves like the current one to the climate crisis, principally driven by carbon pollution from fossil‑fuel combustion. The underlying physics—greater greenhouse‑gas concentrations trapping more infrared radiation—raises baseline temperatures, making extreme heat events more frequent and severe. As a result, temperatures that were once considered unusual, such as 30 °C readings even in midsummer, are now occurring with increasing regularity.
Trends in UK Temperature Extremes
Over recent decades, the UK has witnessed a clear upward trend in both daytime highs and nighttime lows. What were once rare spikes above 30 °C have become commonplace during summer months, and the seasonal envelope of permissible temperatures is shifting poleward. The latest European State of the Climate report confirms that Europe is warming faster than any other continent, a trend that directly influences the UK’s climate patterns.
Future Outlook and Summer Projections
Although the UK’s historically hottest period typically occurs at the end of July or beginning of August, forecasters anticipate that the current May heatwave could presage an even hotter summer. If the atmospheric conditions that produced the 35 °C May reading persist or intensify, later‑summer temperatures may surpass the present extremes, potentially challenging existing July‑August records. This prospect underscores the need for preparedness measures, including heat‑health alerts and infrastructure adaptations.
Broader European Context
The UK’s experience fits within a larger pattern of anomalous warmth across Europe. Many countries have reported record‑breaking spring temperatures, altered precipitation regimes, and increased frequency of heat‑related health incidents. The continent’s accelerated warming amplifies the likelihood of synchronous extreme events, posing challenges for agriculture, energy demand, and disaster response systems that must now contend with a climate that is rapidly departing from historical norms.
Conclusion
The impending 35 °C May temperature in England represents a stark illustration of how climate change is reshaping seasonal expectations. With overnight lows flirting with tropical‑night thresholds, multiple localities already meeting heat‑wave criteria, and scientific consensus linking these events to fossil‑fuel‑driven warming, the situation serves as both a warning and a call to action. As Europe continues to warm at an unprecedented rate, the UK must adapt its public‑health strategies, urban planning, and policy frameworks to mitigate the risks posed by increasingly frequent and intense heatwaves.