A deluge of rain is expected to dampen plans this weekend before a third heatwave in four weeks sweeps the UK, bringing temperatures of around 30°C.
Sunglasses will need to be momentarily stored away as most of the country faces cloudy conditions and frequent rainfall on Saturday and Sunday.
The worst of the rainfall is expected in western Scotland after the Met Office issued a yellow weather warning in place until 3pm Saturday, alerting of possible flooding and difficult travel conditions.
Argyll, Bute, the south Highlands, Mull and Skye could see more than 60mm of rain on Saturday afternoon, while 100mm of rainfall is expected in mountain areas.
Saturday morning is set to begin grey and overcast, with occasional outbreaks of rain and drizzle for some of us pic.twitter.com/6cs2hHaoEx
— Met Office (@metoffice) July 4, 2025Ahead of the rainfall, the Scottish Environment Protection Agency issued six flood alerts in Argyll and Bute, Ayrshire and Arran, Easter Ross and Great Glen, Skye and Lochaber, west central Scotland and Wester Ross.
Across the rest of the UK, outbreaks of rainfall on Saturday are expected to be felt worst in western areas, while persistent and heavy showers are forecast across the southwest. Most of the country is warned to expect patchy drizzle, though conditions should be drier and brighter in the east.
Sunday will bring sunshine while scattered showers continue. This will be heaviest in central and eastern areas and will carry a risk of thunder. More persistent rain is expected in the northeast into Sunday evening.
People are seen wearing caps and holding umbrellas at street near Big Ben in London, United Kingdom on July 1, 2025. The Met Office, weather forecasts for the UK, stated that temperatures could reach 35 degrees Celsius in different parts of the country. (Photo by Rasid Necati Aslim/Anadolu via Getty Images)Brighton beachgoers enjoy the seaside during warm weather last week (Photo: Carlos Jasso/Reuters)As conditions dry up into the second week of July, the Met Office has warned of increasing heat and humid weather, with the potential for another heatwave lasting into next week.
Met Office meteorologist Zoe Hutin said: “Whilst it is difficult this far ahead to determine exactly how hot things could get next week and weekend, there is the potential that some parts of the country could reach heatwave criteria.”
This follows two weekends of heatwave conditions for much of the country in the final weeks of June, which was the hottest on record across England, with Faversham, Kent, hitting nearly 36°C last Tuesday.
To qualify as a heatwave, a location must reach or exceed a certain temperature for three consecutive days, 25°C in the west and north and 28°C in London and the surrounding counties.
Hutin said temperatures were expected to reach the high 20°Cs in the South East on Wednesday, with the potential for low 30°Cs on Thursday.
A farmer inspects rows of lavender as they come into season in Chichester, West Sussex (Photo: Andrew Matthews/PA)She said hot conditions were expected to continue into the weekend because of an area of high pressure building from the West then stretching across the South and drawing in warm air from the Atlantic and Azores.
“Most likely it will be the South and East that see prolonged heat and thus could have another heatwave, but it is too soon to say exactly how high temperatures could get,” Huntin said.
This weekend and the start of next week will be cooler than recent days, she added, with “cloudier skies prevailing and bringing spells of rain at times, especially for western areas”.
“It will be drier overall in the East, though some drizzly outbreaks are still possible on Saturday, with showers on Sunday,” she said.
What is the definition for a UK heatwave?
According to the Met Office, the UK heatwave threshold is met when a location records a period of at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold.
The threshold varies by UK county. The geographical differences reflect the differences in climate across the country.
The threshold temperatures have been calculated using the 1991-2020 climatology of daily maximum temperature at the mid-point of the meteorological summer (15 July).
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