London weather: Four-day yellow health alert triggered as heatwave begins

The alert from the UK Health Security Agency, external (UKHSA), which was issued from 8am on Monday morning will remain in place till Thursday at 5pm (June 27).

A yellow warning indicates that weather conditions could pose a risk to those who are particularly vulnerable.

Temperatures in London are expected to reach 28C this week.

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The UKHSA warns that in London, there are likely to be “minor” impacts on health and social care, including an “increase in risk of mortality amongst vulnerable individuals and increased potential for indoor environments to become very warm”.

Liam Esslick, a meteorologist at the Met Office, said: “According to the latest models, there is a chance temperatures could reach 30C.

“It’s not guaranteed but this will likely be towards the south-east of England, particularly London, Essex and Kent.

“My advice to people would be by all means go out and enjoy. They have been waiting for summer.

“But UV levels are going to be high and the sun will be very intense. Wear protection like sun cream, stay hydrated and try to get some shade in the midday sun.

“People sensitive to the sun should take particular precautions.”