From Wednesday, the heaviest and most frequent showers look most likely to occur in the northwest of England.
In Northern Ireland and parts of northern Scotland and at times there will be thundery weather.
Met Office Chief Meteorologist Andy Page said, “The UK is predominantly under the influence of low-pressure, which is continuing a showery regime, with some potentially heavy and thundery showers possible at times through the week.
“While not everywhere in the UK will experience the heaviest downpours, it will remain an unsettled and relatively cool period, in stark contrast to the heat we experienced in June.”
Met Office Meteorologist and Presenter Alex Deakin added, “What we’re seeing with the jet steam is this shift more towards being directed towards the UK from the southwest, which is helping to push low pressure systems towards the UK.
“Ahead of the weekend, the jet steam is looking to be relatively strong and, as well as bringing a period of some more persistent rain for many, it’s also bringing some strong winds and continuing this fresh period of weather.”