Experts have cautioned that high temperatures on Friday and this weekend will have an impact on persons over 65 and with pre-existing health concerns.
As temperatures rise, health officials have issued the first heat-health advisory of the year for six districts.
The UK Health Security Agency (UKHSA) and the Met Office said that the alert would be in effect for 72 hours beginning at 9 a.m. on Friday.
It will apply to the following areas: London, the East Midlands, the West Midlands, the East of England, the South East, and the South West.
The Met Office predicts “thundery showers” in London on Saturday, despite temperatures reaching 24 degrees Celsius.
Saturday will be the warmest day, with experts predicting temperatures of 27C or 28C, with a minor probability of 29C north of London.
The UKHSA issued a statement warning of a “impact across the health and social care sector” if current anticipated temperatures are met.
The health department asked Londoners to check on relatives, friends and neighbours who may be more vulnerable to illness.
Those at risk should also avoid the sun from 11 a.m. to 3 p.m., when temperatures are at their highest, according to the UKHSA.
During last year’s summer heatwave, which saw temperatures in London exceed 40 degrees Celsius for the first time, the UK recorded 3,200 more deaths than the five-year norm.
The severe heat sparked numerous big flames in the metropolis, with the London Fire Brigade having its busiest day since World War II.
According to the Office for National Statistics (ONS), an additional 3,271 fatalities were reported in Britain during the protracted period of excessive heat in June, July, and August 2022.