The Met Office’s Alex Deakin said isolated showers will persist on Wednesday.
However, for the majority of the country conditions will remain dry as conditions begin to heat up.
He said: “It’s sunny spells with a few showers dotted around on Wednesday.
“Showers will be chiefly over northern Scotland initially, one or two will develop elsewhere across parts of Wales, maybe northern England and southern Scotland where we might just catch a heavy one.
“But most places will dodge the showers completely, there will be sunny spells but some cloud at times.
“It won’t be one of those baking hot summers days but temperatures are on the rise once more.
“It will hit the mid-twenties in places.”
Although Mr Deakin noted a new weather front will approach the UK later on in the week, he said the cloud and rain brought with it will only affect northern territories.
He added Thursday will see temperatures “back on the rise” before they “soar” on Friday and over the weekend.
The Met Office forecaster went on: “There will be the odd shower during Wednesday evening but most places are looking dry and fine.
“A new weather front has thickening cloud and that will be getting a bit closer to the far north-west on Thursday.
“But most places will have a dry and fine start to Thursday with lots of sunshine and it will stay that way for most places but it will cloud over in the north-west with some patchy rain trickling into the Western Isles and the Highlands.
“But for most it is another fine day on Thursday and if anything temperatures are back on the rise and as we go into Friday and the start of the weekend temperatures are set to soar.
“There will be cloud and a bit of patchy rain across northern Britain but not a great deal of rain to come.
“As I said temperatures are back up to 30C in places on Friday.”
Although the Met Office has declared temperatures are set to skyrocket, bookmaker Coral has cut the odds on this month being the wettest July ever recorded.
The company’s John Hill noted: “The heavens are set to open over the next couple of days and as a result the odds have been slashed on this month ending as the wettest July on record.
“There are no signs of temperatures dropping over the next few weeks therefore the betting firmly suggests we are on course for the hottest ever summer in the UK.”