Overview
- The Met Office has issued an amber 'extreme heat' warning for Monday and Tuesday (June 22–23) covering London, much of the east and south‑east, parts of the south‑west and sections of Wales.
- Forecasters put peak temperatures at around 34–35°C with about a 40% chance of exceeding the UK June record of 35.6°C, while warning of high humidity and 'tropical nights' in some urban areas.
- The UK Health Security Agency has amber heat‑health alerts in force through Tuesday and says the heat is likely to increase demand on health and social care and raise the risk of heat‑related deaths among vulnerable people.
- Safety bodies including the RNLI and local authorities warn that warmer weather often brings more open‑water incidents and advise people to choose lifeguarded beaches, carry water and avoid peak sun hours.
- Forecasters say the hot spell is driven by a European 'heat dome' but its duration and extent remain uncertain because Atlantic low pressure may bring heavy rain and thunderstorms to parts of western and northern Britain.