Western Scotland has a Met Office yellow warning for rain issued for Saturday and Sunday. Parts of the region are expected to see downpours with more than 150mm of rain. But across South England and Wales, temperatures are expected to be milder before giving way to highs of 31C (87.8F) by Monday.
Met Office Chief Meteorologist Steve Ramsdale said Scotland will see the worst of the rain, with part of Northeast England also missing out on the sunnier weather.
He added: “There’s a bit of a north-south split in the weather for the UK this weekend, with wet and windy weather across the north and largely fine, dry conditions in the south.
“At the moment our focus is on parts of western Scotland. Although Saturday will start bright and breezy with a few showers, heavy and persistent rain and strong winds will arrive later in the day and continue through Sunday, before finally clearing on Monday.
“It’ll be a largely fine and dry weekend elsewhere though, with long spells of autumn sunshine.”
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Strong winds will accompany the wet conditions in western Scotland and Northern Ireland this weekend.
By the afternoon, southern Scotland, northwest England and northern Wales will see milder, but still soaking, outbreaks of rain.
Temperatures will stay mild in these areas with highs of 15C (59F), but will feel significantly colder due to the strong winds and rain.
Going into Saturday night, western Scotland and Northern Ireland will see wind speeds up to a gusting 75mph, with south Scotland and northern England seeing up to 50mph.
Sunday will again bring heavy rain for the northwest of Scotland, with spells of gloomy weather seen as far down as Manchester.
Temperatures will stay cool in the soaked sections of Scotland, remain in the mid 10C’s.
But for the rest of the UK, it’s expected to be a balmier day, with temperatures heating up as the week ahead rolls around.
London will see highs of 24C (75.2F), along with the south east, and the midlands is set for a pleasant 22C (71.6F).
By Monday the heat plume will begin to surge into the UK, bringing heatwave conditions back to the south east.
Temperatures are expected to go as high as 31C (87.8F) across the south east, with the midlands and Wales seeing 24C (75.2F).
Scotland and the north of England are also expected to see the end of the rain and wind, with conditions returning to normal.
Winds will return to a more manageable 39mph, and temperatures will settle at a brisk 15C (59F).