Temperatures could reach 24C (75.2F) in the West Midlands and southeast Wales on Saturday or Sunday.
It has been one of the warmest days of the year so far in the UK, as some people headed to beaches.
But forecasters’ predictions of Wednesday hitting a 2023 record of 24C (75.2F) fell slightly short of Monday’s yearly high of 23.4C (74.1F), set in Cardiff.
However, the mercury could reach 24C in the West Midlands and southeast Wales on Saturday or Sunday.
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Wednesday’s top temperatures were similar to those in parts of Spain and Greece.
Usk in Monmouthshire, southeast Wales, recorded the highest temperature of the day at 23.3C (73.9F). Thursday is expected to be cloudier but still a “dry, fine day for most”, the Met Office said.
Forecasters say the favourable conditions will be followed by fine weather for the UK over the bank holiday weekend, with Saturday expected to be the warmest day.
But a Met Office spokesman said the warmer weather will not be experienced by all, with the east coast of the UK only expected to see highs of 15C over the bank holiday.
Temperatures in the UK are predicted to be slightly above average for May but it’s not expected to meet the threshold for a heatwave, which is highs of 25-28C (77-82.4F).
Grahame Madge, from the Met Office, said: “There will be little if anything in the way of rainfall apart from the odd very, very light shower.
“For most people, it will be fine and bright with some varying amounts of cloud day by day, but nothing that should trouble anybody.
“It’s probably slightly above average for May but the month has been a different feel with quite a lot of cloud and low temperatures, so it’s great we’re seeing these sorts of temperatures lasting into and over the bank holiday weekend and into the early part of next week.”
He added: “There’s some potential for cloud into the early part of next week that will lower temperatures and brightness a little.”
Read more:
UK to be hotter than Malaga this week
Why has the weather been so bad this spring?
The Met Office declared its first-ever red warning last year as the UK recorded a temperature above 40C for the first time.
The mercury hit 40.3C (104.5F) in the Lincolnshire village of Coningsby on 19 July, breaking the previous record of 38.7C (101.6F) set in 2019 at the Cambridge Botanic Garden.
