UK Endures Record-Breaking ‘Tropical Night’ as May Heat Peaks

On Monday 26 May 2026 the United Kingdom experienced a “tropical night” as minimum temperatures stayed above 20 °C, breaking the May daily‑minimum record for the second day in a row.

Record‑Breaking Night Temperatures Across the UK

• Kenley airfield (south London) recorded a minimum of 21.3 °C, the highest May night ever.
• Kew Gardens (south‑west London) hit 34.8 °C, setting a provisional all‑time hottest spring temperature.
• Previous May night record was 19.4 °C at Kenley on the preceding Sunday.
• 12 locations, from Suffolk to Berkshire, broke their local records on Monday.
• 97 Met Office monitoring sites reached or exceeded 30 °C.

Numbers That Define the Heatwave

• Highs of up to 35 °C forecast for southern England and Wales on Tuesday, with some areas approaching 36 °C.
• Heat‑wave threshold for this time of year is 28 °C (London and northwards to Cambridgeshire).
• Eight parts of England already met the three‑day heat‑wave criteria by Sunday evening, including Heathrow, Kew Gardens, Northolt, and sites in Oxfordshire, Suffolk and Essex.

Implications for Climate Resilience and Public Safety

• Met Office senior forecaster Greg Dewhurst warned that heatwaves are now developing “so quickly” due to the climate crisis.
• Firefighters battled a grass fire near Arthur’s Seat in Edinburgh as temperatures hit 25 °C.
• A 13‑year‑old boy died after drowning in a West Yorkshire reservoir amid the heat.
• Nearly 100 sites surpassing 30 °C underscores how many locations are meeting heat‑wave thresholds.

What the Forecast Holds for the Rest of the Summer

• Temperatures are expected to gradually decline from mid‑week but remain in the high 20s with dry, sunny spells.
• Potential thunderstorms on Tuesday could temporarily curb peak temperatures.
• Continued high night‑time minima suggest that further “tropical nights” are likely as the season progresses.