After a summer marked by repeated spells of extreme heat, many people will be asking the same question: is another UK heatwave still on the way before autumn arrives? The latest Met Office outlook does leave the door open to more late-summer heat — but it is not predicting another nationwide heatwave at this stage. (Met Office)
What’s actually true
The latest Met Office forecast gives a mixed picture for the remainder of August. From Friday 21 August to Sunday 30 August, the UK is expected to see changeable conditions, with showers and longer spells of rain in many areas, alongside some drier periods as high pressure moves across the country.
Temperatures are still more likely to be above normal overall. However, the Met Office says the likelihood of widespread or exceptional heat is lower than it has been during recent weeks. (Met Office)
The more interesting part of the forecast comes as meteorological autumn begins. For the period from 31 August to 14 September, the Met Office says forecasting signals are weak, meaning conditions close to the seasonal norm are currently the most likely outcome.
Even so, temperatures are expected to be above average overall, and the forecast specifically says there is a chance of late-season hot spells or heatwaves, particularly in southern parts of the UK. (Met Office)
That means a second heatwave is possible, not promised.
What does this mean for another UK heatwave?
The distinction matters. A long-range outlook does not tell us that a heatwave will begin on a particular date or reach a particular temperature.
The Met Office explains that its three-month outlooks work in terms of probabilities and broad trends rather than predicting specific weather on specific days. Even when warmer conditions are favoured, cooler or wetter spells can still occur. (Met Office)
That is why headlines suggesting that another major heatwave has already been “forecast” should be treated cautiously.
There is, however, a genuine reason to keep an eye on the weather. The UK has already experienced an exceptionally hot summer, with the latest heatwave reaching a provisional 38.1°C at Kew Gardens on 13 August — the fifth hottest day on record for the UK. (Met Office)
The current forecast therefore points towards continued warmth with uncertainty over whether another genuinely exceptional spell develops.
Common misconceptions about long-range weather forecasts
One common mistake is treating a seasonal outlook like a normal weather forecast. It is not.
A forecast several days ahead can provide increasingly useful detail about temperatures, rainfall and warnings. A longer-range outlook is instead about the probability of broader patterns. The Met Office itself stresses that such outlooks should be read alongside shorter-term forecasts. (Met Office)
Another misconception is that a warm September automatically means another heatwave. A month can be warmer than average without experiencing the prolonged, unusually hot conditions required for an official heatwave.
Equally, the end of August does not mean the risk of hot weather suddenly disappears. The latest Met Office outlook explicitly leaves open the possibility of late-season heat, particularly in southern England. (Met Office)
What should people do next?
For most people, there is no reason to change plans based solely on a possibility several weeks away.
Instead, check the Met Office forecast as your plans get closer, particularly if you are travelling, attending outdoor events or looking after someone who may be more vulnerable to hot weather.
During any future hot spell, sensible precautions remain important: drink regularly, avoid prolonged exposure to strong sunshine, keep homes as cool as possible and check on vulnerable relatives, friends or neighbours.
Those living in areas affected by the current dry conditions should also pay attention to local water-use guidance and wildfire warnings, which can vary significantly around the UK.
The bottom line
Another UK heatwave before autumn cannot be ruled out, and the Met Office says late-season hot spells remain possible, especially in the south. But there is currently no firm forecast of another widespread extreme heat event.
For now, the message is one of continued warmth, but considerable uncertainty. The next few forecast updates will be much more useful for determining whether a genuine heatwave is taking shape.
