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With some sunshine for most of England and Wales over the weekend, along with a southerly breeze, temperatures will climb to 22 to 27C, perhaps 28C (82.4F) in south-east England by Sunday.
These temperatures will be around 6 to 8C above average for early June.
Some of the warmth will extend into Northern Ireland and southern Scotland with highs on Sunday of 20 to 22C, but it will be closer to average in more northern areas with 17 to 20C.
It will also be cloudier across more northern areas of the UK over the weekend.
This warmer-than-average weather is forecast to last into next week, but to become an official heatwave temperatures need to be higher than 25-28C - depending on location - for three days in a row.
While it's possible some areas might reach this definition, it is still a little too early to say with certainty. Not all of the weather models agree on how the high pressure is positioned through the week ahead.
Some forecast models keep it across the UK which would mean that temperatures stay in the mid- to high 20s.
Others move the high pressure away to the east and allow the westerlies from the Atlantic to move back in. This would bring a drop in temperature along with cloud and showers.
You can keep up to date with your latest BBC Weather forecast here.
