Some parts of the UK are now approaching a fortnight of heatwave conditions.

Places in southern England have recorded an unbroken run of 13 days above their heatwave criteria, and with Merryfield in Somerset reaching 30.6C (87.1F) on Thursday, the UK has seen 12 consecutive days at or above 30C, the longest such spell since 2006.

In Bournemouth and Heathrow, temperatures above 26C and 28C respectively have continued now for nearly two weeks and whilst some slightly cooler air will arrive from the north this weekend, a few locations may well see another few days of heatwave yet.

However, the 1976 UK record of 16 days at or above 30C seems unlikely to be broken.

One of the most striking features of this heatwave has been how long it has lasted. Several factors have come together to create this intense and lengthy spell.

First, our climate is changing – fast. Temperatures in the UK are now on average 1.33C warmer than they were during 1961-1990. However, the very hottest days have warmed three times quicker than this – by 4.5C in the Greater London region – according to the Met Office.

Secondly, the weather set-up so far this summer has been especially conducive for building heat. The jet stream has meandered well to the north of the UK, allowing high pressure to build and warm air to drift in from south.

As the high pressure has been so slow moving we have seen the development of a “heat dome”.

This weather pattern results in air sinking downwards, compressing and heating up as it hits the ground. This air also dries out, meaning no clouds can form, so strong sunshine is able to heat the ground even further.

This year is already shaping up to be an extraordinary one for weather records in the UK, having broken those for monthly temperature in both May and June by more than two degrees.

This is the third heatwave of 2026. At the same point last year, we had also just seen the third heatwave of 2025. However, last July, some places in the south saw four consecutive days above 30C.

So far this July we have now reached 12 days above 30C and 13 days in heatwave criteria across parts of England and Wales.

Heatwave conditions have also gripped parts of Scotland and Northern Ireland this week but the heat has been less intense and has not lasted as long.

Comparisons are being made with the historic hot summer of 1976. Whilst that year still holds the record for the longest heatwave, this year has seen higher extreme temperatures, and more “very hot days”.

The dryness as well as the heat has been particularly notable. Some places in southern England such as Wisley in Surrey have seen no rainfall in 30 days.

Most of Wales and Northern Ireland have also had rainfall deficits, although parts of western Scotland have been wetter than average. That said, nowhere in the UK is currently in drought unlike the widespread one which accompanied the heatwave in 1976.

As well as the duration and frequency of the heatwaves of 2026 so far, it has been the intensity that has been remarkable.

This year has seen more days – six – in excess of 35C, and 35C has been recorded in three consecutive months (May, June and July) for the first time.

The Met Office says heatwaves in the UK are becoming “more frequent, long-lasting, and intense”.

Its latest State of the UK Climate report concludes that “the number of days of over 30C has quadrupled in areas such as Greater London”.

Heatwaves are now also increasingly occurring outside the normal summer months.

For example, in September 2023, an autumn heatwave brought seven consecutive days of temperatures over 30C.

This year the first record-breaking hot spell was in late May. It was an unprecedented heatwave for the time of year, which not only saw the UK’s highest May daytime temperature but also broke the record for an overnight minimum temperature at 21.4C – the UK’s first tropical night of 2026.

Winds are expected to become more northerly this weekend, meaning a slight dip in temperatures for many places.

Scotland, Northern Ireland and north-east England will have more cloud, and temperatures in the low 20s.

Much of England and Wales will stay sunny, dry and warm at 24 to 27C, but 28 or 29C is possible in some spots in the south. It is likely that some places will stay in heatwave criteria throughout the weekend.

The longer-range forecast for the remainder of July shows a likelihood of high pressure continuing to bring dry and warm weather.

Temperatures will stay above average, but overall not as high as recent days. There is a chance of a few showers late in the month, especially in the north.

Into August weather prediction models are hinting at a return to more changeable conditions but it’s likely that temperatures will often stay above average.

Check more details in our monthly outlook.