The heaviest of the rain will fall around Edinburgh on July 30, but Northern Ireland, England, and Wales will all see downpours.
On July 31, the rain will get heavier for most, with the worst-affected areas Manchester and North Wales. The only area of the country that should escape the wet weather is London, the south-east of England, and the Midlands.
However, those in south-western areas will be see heavier downpours on July 31 compared to July 30.
The Met Office long-range weather forecast for July 21 until August warns of a “rather more changeable pattern of weather through this period” in comparison to a lot of the summer so far.
“It continues: “Wednesday will likely see a continuation of heavy, perhaps thundery showers, although the focus may be more across the north and east by this stage.
“Thereafter, a general westerly or north-westerly regime looks to become established, with occasional weather systems moving in from the Atlantic.
“This means further rain or showers and breezy conditions at times, especially in the northwest.
“This will be interspersed with some drier, sunnier periods. Temperatures are expected to be close to or a little above average for most of the period. This broad pattern is likely to continue through to the end of July.”