The Met Office issued an amber warning this week against the heat wave.
In some parts of England and Wales, it covers four days from Thursday to Sunday.
People are told to be aware of the signs of heat exhaustion and other illnesses caused by high temperatures.
The Met Office states that'is likely to require some changes in work practices and day-to-day operations. '
The warning adds: Areas, lakes, rivers and other beauty spots increase water safety and the risk of fire-related accidents.
'Road, rail, and plane travel can be slightly delayed, and prolonged delays can lead to welfare issues. '
Vulnerable people can have a negative impact on health, but a larger population can also be affected, the warning said.
Temperatures have already risen this week, with temperatures expected to reach 29 ° C in London, 28 ° C in Southampton and 26 ° C in Exeter.
The heat peaks on Fridays and Saturdays and is expected to remain warm all night, especially in metropolitan areas.
A Level 3 thermal health alert came into effect today as the country prepares for another heat wave.
Temperatures will reach low temperatures in the central and southern regions from the mid-30s by Thursday, when the Met Office's amber warning begins.
Monthly rainfall was low, combined with record temperatures last month, rivers were at very low levels, reservoirs were depleted, and soil was dry.
Even in some parts of the country officially recorded the driest July since the record began in 1836.
All of these put pressure on the environment, agriculture and water supply and encourage wildfires. On Friday,
people in Kent and Sussexface a hose pipe banas part of a bid to combat the dryness caused by heat waves.
South East Water, which supplies 2.2 million real estate, said, "If our neighbors knowingly or unknowingly ignore the restrictions, we will take appropriate action."
The Met Office warns that "there is little meaningful rain" on the horizon in the dry regions of England, as temperatures are set to rise to 30 degrees Celsius next week. Please contact the news team by sending an email to
webnews@metro.co.uk.
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