Another level three heatwave is set to hit Berkshire tomorrow and could last for seven days.

Temperatures are predicted to rise above 30C between midday tomorrow and 6pm on Saturday, but some indicators show the wave lasting until August 16, according to the Met Office.

The heat will bring a greater risk of wildfires, Bracknell Forest Council warned in a statement.

“Grassland is extremely dry in this heat and even a small cigarette butt can destroy whole fields of crops,” said a spokesperson.

“Please do not leave bottles or glass in woodland as sunlight shining through glass can start a fire. Simple measures can prevent unnecessary strain on our fire services who are expected to be very busy over the coming week. Please take you litter home and recycle where you can.”

They added: “The effect on the body of entering water 15°C and below is often underestimated. The shock could lead to a person drowning.

“Average UK and Ireland sea temperatures are just 12°C. Rivers such as the Thames are colder, even in the summer.”

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Tuesday and Wednesday are set to reach 28C while Thursday should climb to 30C and the hottest days are expected to be Friday and Saturday at 31C.

Met Office Deputy Chief Meteorologist Tony Wardle said: “Temperatures could peak at 35C, or even an isolated 36C on Saturday.

“Coupled with the high daytime temperatures will be continued warm nights, with the mercury expected to drop to only around low 20s Celsius for some areas in the south.”

The heatwave comes soon after record temperatures were recorded across the UK on July 19.

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Dr Agostinho Sousa, Head of Extreme Events and Health Protection at the UK Health Security Agency (UKHSA), said: “Temperatures will feel very warm again this week, particularly in southern and central parts of the country.

“We want everyone to enjoy the warm weather safely when it arrives, but remember that heat can have a fast impact on health.

“It’s important to ensure that people who are more vulnerable – elderly people who live alone and people with underlying health conditions – are prepared for coping during the hot weather.

“The most important advice is to ensure they stay hydrated, keep cool and take steps to prevent their homes from overheating.”