Another heatwave could be on the way this weekend, forecasters say.
Temperatures could reach 30C, but some showers are expected before then amid more changeable weather.
Some parts of the UK will experience highs of 29C on Saturday, with the potential for 30C on Sunday and 31C on Monday, according to the Met Office.
Last Saturday was the hottest day of the year so far, with a provisional temperature of 33.2C recorded in Charlwood, Surrey.
The Met Office confirmed “many places” in England and “one or two areas” in Wales, including Cardiff, entered a heatwave last Friday.
A heatwave is recorded when an area reaches a certain temperature – the level of which varies across the UK – for three consecutive days.
Music fans can expect a mixture of sunshine and rain at this week’s Glastonbury Festival, where more than 200,000 people are expected to attend.
‘Risk of showers and thunderstorms’
Oli Claydon, from the Met Office, said Wednesday would be “warmer” with “an increasing risk of showers and thunderstorms”.
He said temperatures would reach a maximum of 27C on Thursday, with potential for heavy showers in the east and more persistent rain in the northwest of Scotland into the evening.
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“Friday will see a maximum of 27C again as the high, the showers will clear away to the northeast, with local drizzle in parts of the South West and Wales through the day,” Mr Claydon added.
The South East of England is expected to experience the highest temperatures, potentially reaching 29C on Saturday and 30C on Sunday.
Temperatures could reach up to 31C on Monday, but there was lower certainty around that, Mr Claydon added.
Mr Claydon said it was possible the South East of England “could be looking at a short-lived localised heatwave”.
“When we had the warm spell last week it was much more widespread, we’re not likely to see that,” he added.
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So far, this month’s average daytime temperature is 19.2C, slightly above the June average of 17.68C.
But the Met Office said that temperatures were expected to fall next week.
