Temperatures in most of Britain are expected to rise to possibly 27C in what would be the hottest period of the year.
Saturday could be “16-19C wide — with 24C the possible high in the southeast,” said Met Office meteorologist Aidan McGivern.
Lots of sunshine is expected from the north of Scotland to the south of England, with only a few patchy clouds in the northern and western areas.
However, the Met Office warned that Saturday’s sunshine could be followed by heavy rain and thunderstorms as the sky warms.
“By Saturday evening those showers would appear in the southwest [of England]which is quite widespread in southern parts of England and South Wales,” McGivern said.
“In some places it would just be a downpour, but for central and southern England and the south coast there is a risk of heavy downpours, thunderstorms and frequent lightning.”
Sunday would probably be another beautiful day.
Warm air from North Africa will bring above average temperatures for May in most places in the UK over the next week, but will be interrupted by possible severe or thunderstorms.
The Met Office said parts of the Southeast could potentially reach highs for the week of 25C-27C.
Met Office spokesman Richard Miles said: “Right now Tuesday seems to be the hottest day of the week”.
Throughout the week, some people will enjoy warm, sunny spells, but heavy showers will move across the country, especially in the north and west. These can be irresistible at times in parts of southern, central England and southwestern Scotland.
Met Office meteorologist Andy Page said: “The plume of warm air we expected from the south will bring higher temperatures across the country over the next week.
“However, it appears that the effects of the Atlantic trough will prevent a continued high-pressure build-up from the east.
“This means that while we may see some warm – and in some places very warm – days, the coming week will generally feel more like what we would expect from a warm period in May, with some heavy showers nearby, instead of hot summer weather.”