This is a 9 day panel image from the GFS.
It shows high pressure builds across Southern Britain during Sunday 17th, with temperatures Sunday reaching 22 c.
On Monday 18th we could see temperatures reaching 25 c.
Tuesday 19th the high pressure moves eastwards this will allow hot air moving up from Span through France and reaching our area with temperatures reaching 27 c.
During Wednesday 20th a low pressure system is close by bringing a risk of thunderstorms moving up from France into the UK Temperatures falling a little down to 23 c.
Come Thursday temperatures will be around 20 c and by Friday temperatures down to 16 c.
So a short spell of hot temperatures is on its way.