Overview
- The Met Office has extended amber 'extreme heat' warnings for large parts of southern and central England and parts of Wales to run Monday through Thursday, June 22–25, with forecasts showing temperatures peaking midweek around 37–38°C in London and the south.
- The UK Health Security Agency has issued amber heat‑health alerts that warn of likely increased demand on health and social care services and advise people to stay hydrated, avoid the sun during the hottest hours, and check on older or sick neighbours.
- Forecasters say the heat and high humidity could disrupt transport, energy and water systems and force changes to working practices as some heat‑sensitive equipment and infrastructure may fail or face strain.
- Very high overnight temperatures and dew points mean widespread 'tropical nights' are expected, which will reduce night‑time cooling and raise the risk of heat stress for people sleeping in poorly ventilated homes.
- Experts link the event to a high‑pressure 'heat dome' and note human‑driven warming makes such heatwaves more intense; agencies also warn of increased water‑safety incidents and say there is a growing chance the long‑standing June record could be broken with isolated spots possibly approaching 40°C.