Devon and Somerset Fire and Rescue urge people to be mindful of wildfires
It's as temperatures will hit over 30 degrees today.
People are urged to take extra care when it comes to barbecues in the heat.
Devon and Somerset Fire and Rescue are asking people to be mindful of wildfires.
They're asking people to also discard cigarettes carefully, with the risk being high due to dry weather.
The highest temperatures are forecast for today, with Somerset expected to deal with the hottest weather over 30 degrees.
Despite not being as warm as the heatwave at the beginning of July, the hot spell is forecast to last longer and cover a broader area, according to the forecasting body.
The UK Health Security Agency issued yellow heat health alerts on Wednesday covering parts of central and southern England, valid until 10am on July 15, with the body extending the warning to cover all regions in England from 11am on Thursday.
According to the Met Office, temperatures are expected to reach 27-29C widely across England and Wales on Thursday afternoon, with isolated spots in the West Country and London area potentially seeing highs of 31C.
There is a "low probability" of reaching 32C, the forecasting body added.
Saturday is set to be the hottest day of the week, with high UV and pollen counts across much of the country, before a similarly hot day on Sunday with temperatures forecast between 27 and 31C.
"Prepare for some hot conditions as a heatwave returns to the UK," Met Office meteorologist Clare Nasir said.
Ms Nasir advised people to "stay hydrated", echoing warnings from the Royal Society for the Prevention of Accidents (RoSPA) which urged the public to drink water regularly, seek shade and use sunscreen.