After weeks of unpredictable skies, the UK is finally set for a burst of true summer heat—and it’s coming in hot.
As families wrap up the first weeks of the school holidays, a scorching stretch of weather is heading in, and it’s bringing temperatures that could top 33°C.
Let’s break down what’s coming, when to expect it, and why health officials are sounding the alarm.
Heatwave Set to Begin in Southern England
Starting this Sunday or Monday, southern parts of England will kick off what’s expected to be the first official heatwave of the summer holidays.
With the mercury gradually climbing over the weekend, the real heat is forecast to hit by the start of next week.
In London, for example, the forecast looks like a slow but steady rise: 25°C today, nudging up to 26°C tomorrow, and then ramping up to 28°C by Sunday.
But that’s just the beginning—by Monday, temperatures could reach 31°C and soar to 33°C on Tuesday.
The heat is then expected to hold above 28°C on both Wednesday and Thursday.
Yellow Heat Alert Issued for Most of England
The UK Health Security Agency (UKHSA) has issued a yellow-level heat health alert covering almost all of England—everywhere except the North.
This alert will be in effect from 12pm on Monday through to 6pm Wednesday.
Government officials have cautioned that this spike in heat could put significant strain on health and social care services.
There are concerns about increased health risks, particularly for older adults (65+) and those with pre-existing conditions.
What Counts as a Heatwave in the UK?
According to the Met Office, an official heatwave is declared when a location meets or exceeds a set temperature threshold for three consecutive days. These thresholds vary by region:
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25°C for Scotland, Northern Ireland, the North of England, Wales, and South West England
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26–28°C for Central and South East England
And right now, many regions are on track to hit those marks.
Tropical Storm Dexter’s Warm Legacy
This spike in temperature isn’t coming out of nowhere.
What’s left of Tropical Storm Dexter is playing a big role by dragging in warm air from the South West.
As a result, central, southern, and eastern England are expected to feel the brunt of the heatwave early next week.
Met Office deputy chief meteorologist Steven Keates confirmed, “We’re confident temperatures will climb sharply from Monday, reaching low 30s in many places, and possibly mid-30s in a few hotspots by Tuesday.”
That said, Keates added a note of caution—the duration of the heatwave remains uncertain.
It could stretch longer into next week, especially in the south, but current forecasts don’t yet guarantee that.
This Weekend: A Mix of Sun, Showers, and Heat Build-Up
Before the heatwave rolls in, this weekend will offer a mixed bag.
Much of England and Wales can expect sunny spells on Saturday, with Northern areas—particularly North West Scotland—seeing some rain.
Come Sunday, a weather front is expected to drift in from the west, bringing rain to Northern Ireland, parts of Scotland, and possibly northern England by the evening.
Meanwhile, the South and Centre of England should stay dry and start to feel the temperature rise.
Public Health Warning: Don’t Underestimate Moderate Heat
UKHSA consultant Anya Gopfert reminded the public that even moderate heat can be dangerous.
“Our research shows that even modest temperature increases can lead to serious health issues, especially for the elderly,” she said.
Her advice? Enjoy the weather—but be cautious. Stay hydrated, stay cool, and look out for people who might be more vulnerable, especially friends, neighbours, or family members with health conditions.
What to Expect Early Next Week
By Monday and Tuesday, areas across southern, central, and eastern England could see temperatures climbing well past the 30°C mark.
That’s beach weather for some—but for others, especially those with health concerns, it’s a serious risk.
The Met Office and UKHSA are urging people to stay tuned to forecasts and follow health guidance.
This includes keeping homes cool, drinking plenty of fluids, and checking on those who may need support.
What’s Next?
While the next few days bring a taste of real summer, experts are keeping a close eye on how long this heat will last.
The transition from tropical storm patterns to longer-lasting high pressure is still unpredictable.
In short: make the most of the sun, but take it seriously.
The warm spell is welcome—but it’s also a reminder of how quickly heat can shift from pleasant to dangerous.