England is facing a heat warning for Sunday with temperatures expected to soar to 25C across the country.
As a result, the public has been advised to stay indoors during the hottest part of the day as the mercury rises.
Met Office forecasts confirm that Sunday will likely be the warmest day of the week, with particularly high temperatures in the capital and surrounding areas.
Thermometers are set to reach 25C in no fewer than 10 locations in England at 3pm.
Health experts are concerned about the potential impact of the heat on vulnerable people.
The sudden temperature spike has prompted authorities to issue guidance on how to stay safe during the hot weather.
PICTURED: People enjoy the warm weather in St James's Park, London
PA
UV rays are at their strongest between 11am and 3pm, creating a four-hour window of particular concern for public health officials.
Experts warn that exposure during this peak period can lead to heat exhaustion and other heat-related illnesses.
The public has been specifically urged to remain indoors during these hours to minimise health risks.
"If you have to go outside, stay in the shade especially between 11am and 3pm, wear sunscreen, a hat and light clothes, and avoid exercise or activity that makes you hotter," NHS guidance says.
"Close windows during the day and open them at night when the temperature outside has gone down. Electric fans can help if the temperature is below 35C.
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Temperatures will soar across the country by Sunday afternoon
MET OFFICE
"Check the temperature of rooms, especially where people at higher risk live and sleep."
The forecast suggests that temperatures will begin to drop from Monday onwards, providing some relief after Sunday's peak heat.
The public health warning applies particularly to households across England, where the temperature spike will be most pronounced.
Meteorologists will continue monitoring the situation as the weekend progresses, with updates expected if conditions change significantly.
The 'stay indoors' warning has drawn severe criticism online - with Britons urged to go out and enjoy the sun instead
PABut the "stay indoors" warning has drawn severe criticism online.
Gawain Towler, Reform UK's former communications chief, said on social media: "For pity's sake, can we stop being treated like children?
"Go on enjoy the sun, have fun... We are pathetic," he added.
