Londonderry has today, 20 July 2026, registered its highest temperature in decades, as a significant heatwave continues to grip the United Kingdom. The city in Northern Ireland saw thermometers climb to 31.5°C by early afternoon, surpassing previous long-standing records for the region. This unprecedented heat is part of a broader weather pattern affecting all four nations, prompting widespread alerts from the Met Office and health authorities.
Across the UK, the Met Office has issued a series of weather warnings. An amber warning for extreme heat is currently in place for much of England and Wales, with temperatures expected to reach up to 35°C in some southern and central areas. Scotland and Northern Ireland are under yellow warnings, indicating a risk of high temperatures and potential disruption, though not to the same extreme levels as further south. Wind speeds remain relatively light, generally below 10 mph, offering little relief from the intense heat.
Public health bodies in England, Scotland, Wales, and Northern Ireland have reiterated advice for staying safe during the heatwave. The guidance includes staying hydrated by drinking plenty of water, avoiding strenuous activity during the hottest parts of the day, and seeking shade. Vulnerable groups, including the elderly, young children, and those with pre-existing health conditions, are particularly advised to take extra precautions. Local councils have also activated their severe weather plans, with some opening cooling centres and increasing welfare checks on at-risk individuals.
The prolonged period of high temperatures is also raising concerns about potential impacts on infrastructure and the environment. There is an elevated risk of wildfires, particularly in rural and coastal areas, leading fire services to urge extreme caution with barbecues and discarded cigarettes. Transport networks may also face disruption, with speed restrictions potentially introduced on some rail lines due to the risk of buckled tracks. While the current forecast suggests a slight easing of the extreme heat towards the end of the week, temperatures are expected to remain above average for the time of year for now.
Looking regionally, England is experiencing the most intense heat, with London and the South East forecast to hit 34-35°C. Wales is seeing widespread temperatures of 30-32°C, particularly in the south. In Scotland, temperatures are generally in the mid-20s, but some central and eastern areas could reach 28°C. Northern Ireland, as exemplified by Londonderry's record, is also facing exceptionally warm conditions, with Belfast expected to reach 30°C. The Met Office advises checking local forecasts regularly for the most up-to-date information and warnings.