In what would be the third day of temperatures above 30°C – officially classified as a heatwave – large parts of the south and the Midlands will temperatures between 31-33°C.
The warning covers the Scottish Borders and Wales as well as the north west and north east of England.
“Two days ago, we did get to 32.3 degrees at Kew Gardens and Heathrow which was the warmest day of the year so far.
Showers drifting northwards this afternoon could bring occasional rumbles of thunderFeeling hot in the hazy sunshine around these pic.twitter.com/2TdDlgIqIL
— Met Office (@metoffice) June 21, 2025“There is still a very small chance we might get to 34, but I think 32 or 33 degrees is more likely. I wouldn’t rule out 34, but it very much depends on cloud.
Amber health alert
Saturday marks the summer solstice – the longest day of the year – and people across the UK have been celebrating at sites such as Stonehenge.
An amber heat health alert, issued by the UK Health Security Agency for the first time since September 2023, is currently in force across England.
Yellow weather warning UPDATED Thunderstorms across parts of northern England and Wales, plus southeast ScotlandSaturday 1700 – Sunday 0300Latest info t.co/QwDLMfS950Stay #WeatherAware t.co/D6iB9RTPKb pic.twitter.com/s0Y6gAsjUC
— Met Office (@metoffice) June 21, 2025“Those showers will continue to move north eastwards as we go through the rest of the afternoon.
“We have got a yellow weather warning out which starts at 5pm and goes through until 3am covering the very far north east of Wales, northern parts of England and then into the very far southeast of Scotland as well.”
She said: “As is the nature of thunderstorms, not everywhere in that warning will see a thunderstorm and not everywhere in that warning will see a heavy shower, but if you do see one, it could lead to a few impacts.
People gather at Stonehenge, Wiltshire, during sunrise on the summer solstice, the longest day of the year. Picture Saturday June 21, 2025. PA Photo. Photo credit should read: Zhanna Manukyan/PA Wire
“As we go in tomorrow, it’s more a day of sunny spells with showers for much of the country with the south east getting the driest conditions.
“But elsewhere it is going to feel a lot fresher than it has felt recently with some brisk westerly winds, some sunny spells and some showers.
What is a heatwave?
The Met Office defines a heatwave as at least three consecutive days of temperatures above what would normally be expected for that time of the year. The threshold is different for each county, depending on where they are in the country, and it is usually accompanied by high humidity.
Generally speaking, the threshold is higher in the south-east, with the minimum value being 25ºC in parts of Wales, the Midlands and the South West.
Because the UK is centred below a jet stream, high pressure can often develop over it, resulting in persistent dry and settled weather.
Drought fears
Yorkshire became the second region to a declare drought earlier this month after officials in the North West of England did so at the end of May following the driest spring since 1893.
Parts of Wales could come under a hosepipe ban in the coming weeks as Welsh Water declared a “drought developing zone” due to dry weather.
Low water levels impact the Woodhead Reservoir where the normally covered bed is revealed on June 11, 2025. (Photo by Christopher Furlong/Getty Images)
Claire Tunaley, senior hydrologist, at the water resources unit at the Scottish environmental protection agency: “It won’t take a heatwave for river levels to fall again.
“Rivers entered summer already stressed after months of below average rainfall, and the kind of brief periods of rain we can get over the summer often don’t soak in properly or evenly enough to reverse that.
“Less water in rivers means warmer temperatures, lower oxygen, and shrinking channels, all of which increase pressure on fish, aquatic life, and habitats.
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