The good news is there are hints of something fresher arriving next week as winds veer in from a northerly direction.
Thermometers have already hit 31.5C (88.7F) in parts of the country today as what could be the longest heatwave in history grips the nation.
Tennis fans are braving almost unprecedented heat at Wimbledon amid predictions this year’s tournament could be the hottest on record.
Thousands of people have descended on the capital for the annual Pride parade in temperatures around 10C higher than average for the time of year.
Experts say the hot weather will continue through next week although a Polar airflow will make it feel slightly fresher.
Temperatures will dip into the low to mid-20Cs across much of the country by Tuesday, according to the Met Office.
We are currently just 0.7C off the hottest day of the year so far for England and it is likely that we will surpass this by the end of the day
However meteorologist Simon Partridge predicted a sweltering couple of days ahead with no sign of rain on the way.
He said: “We are currently just 0.7C off the hottest day of the year so far for England and it is likely that we will surpass this by the end of the day.
“Tomorrow is looking similar, it could even be slightly warmer with lots of fine, dry and sunny weather on the way.
“We could see highs of 30C (86F) again on Monday, we then get a polar maritime airflow which will make it feel slightly fresher.
“However this is relative and it is still going to feel very warm and this is expected to be the theme at least into the middle of the month and there is no sign of any real change on the way.”
UK heatwave: Hot air over the UK will see temperatures rocket
The Met Office with Public Health England (PHE) has issued a level-3 heat health alert which will remain in force into the start of next week.
The advisory – one step below national emergency – warns southern, central and western regions will endure the highest temperatures tomorrow.
It states: “The very warm, locally hot, conditions are set to continue over the weekend.
“The highest temperatures are likely to occur on Sunday in parts of southern, central, and western England.
“Stay out of the sun; keep your home as cool as possible – shading windows and shutting them during the day may help.
“If there’s anybody you know, for example an older person living on their own, who might be at special risk, make sure they know what to do.”
The highest UK temperature so far this year is 33.0C (91.4F) recorded in Porthmadog, Wales, at the end of June while for England it is 32.2C (89.96F).
UK heatwave: Sunday is set to be boiling with temperatures hitting 86F
UK heatwave: Weather will feel fresher next week as winds move in
Temperatures have reached or surpassed 28C (82.4F) for 13 days in a row with similar values expected through to mid-month.
If the trend continues past the 19-day mark it will beat the current record set in August 1997, the Met Office said.
Government records reveal temperatures reached 28C or above for 16 days in July 2006; 13 days in August 2003; 19 days in August 1997; 15 days in August 1995 and in 1976, the year of the historic scorcher, twice for 18 days – in June/July and again in August.
Former BBC forecaster Michael Fish said the unusually warm weather will continue next week with no end in sight to the heatwave.
England fans in Russia will also be braving blowtorch conditions as temperatures hit 30C in Samara as the Three Lions take on Sweden, he added.
He said: “There is no change in the offing with no let up in the heatwave or the drought.
“It won’t be as hot every day next week as there is going to be a change in the wind direction and this will cool things down.”
“It is going to be pretty hot and steamy in Russia for the football and it is going to stay pretty hot over the weekend.
“We have high pressure over us and it looks as though we have high pressure over us through the week although this then slips to the west bringing a more northerly airflow.
“There is a chance that next weekend things may break down with some thunder storms.”
AccuWeather forecaster Faith Eherts warned Wimbledon-goers to brace for a sweltering week of tennis.
She said: “No relief from the heat is expected on Monday as temperatures once again soar to 29-30 C (85-86 F) with no rainfall in sight.
“A brief lowering of temperatures is possible by Tuesday or Wednesday as flow from north spreads over England.
“High temperatures may fail to reach 27 C (80 F) for a day or two before rising again late next week.
“According to the UK Met Office, this could be the hottest Wimbledon on record if the high temperature averages higher than 25.4 C (77.7 F) throughout the 14 days of the tournament.
“The previous record was set in 1976.”
WeatherOnline forecaster Simon Keeling said very hot weather will hold out at least until the middle of next week.
He said: “At the moment little change in the forecast by next Wednesday with still high pressure the dominant feature across much of the UK.
“A lot of dry weather is still forecast to be maintained by next Thursday at the moment despite a risk of some locally heavy and perhaps thundery showers developing in places, but perhaps particularly across south-west England.
“Pressure may begin to slowly fall by next Saturday but certainly uncertainties, but may be a greater risk of a few heavy or thundery showers breaking out across parts of England and Wales, otherwise there is still likely to be quite a lot of dry weather with some bright or sunny spells too.”
The Met Office’s long-range outlook predicts above-average temperatures largely holding out until the end of the month.
It states: “Temperatures are likely to be above average for many with further very warm spells possible, most likely in the south.
“Temperatures will be closer to average in any unsettled spells, these most likely in the north and northwest.”