Met Office puts summer 2026 at 16.5 C, the hottest UK season in the 1884 series

The Met Office said on 1 September that the United Kingdom's mean temperature for June, July and August 2026 was 16.5 C. That is the highest seasonal figure in a series that starts in 1884, and it is the highest summer mean on the same books. Last summer, at 16.1 C, held the record for a year. The famous summer of 1976 has now dropped to seventh.

The five warmest UK summers are 2026, 2025, 2018, 2006 and 2003. All five have arrived since 2003. Amy Doherty, who runs the National Climate Information Centre, said the size of the gap over last year's record was the point that stood out. Mark McCarthy, who leads climate attribution at the agency, said a summer this warm was about 130 times more likely because of human-caused greenhouse gases. In a climate without those gases, he said, the UK would see a summer like 2026 roughly once in 1,000 years.

The national mean hides four different countries. England averaged 18.2 C, 2.5 degrees above the 1991-2020 normal, and broke its record. Wales averaged 16.9 C, 2.2 degrees above normal, and broke its record. Northern Ireland averaged 15.4 C. Scotland averaged 13.8 C and was only jointly sixth-warmest. Rainfall for the UK was 195.4 mm, 77 percent of normal. Sunshine was 621.9 hours, 123 percent of normal. England was the dry pole: 132.9 mm of rain, 64 percent of normal, and 752.2 hours of sun. England's July was the driest on record, with 5.6 mm.

Fifty-four of the Met Office's weather stations set all-time daily maximum records. The country logged 40 days at or above 30 C, above the old mark of 34 days set in 1995. The highest reading of the summer was 38.1 C at Kew Gardens on 13 August. That is the fifth-hottest UK day on record. The hottest remains 40.3 C at Coningsby in July 2022. A separate June record fell at Lingwood in Norfolk on 26 June, at 38 C, above the old June mark of 35.6 C from 1976. On daytime maxima alone, 2026 also beat 1976.

Five heatwaves, wildfires and a drought sat under those averages. Fires burned on heath in the New Forest, at Dunwich Heath in Suffolk, at Headon Warren on the Isle of Wight, at Llanwonno in South Wales and in the Cairngorms. Disposable barbecues were banned for a time. Andy Burnham, now prime minister, had called the country a tinderbox while the fires were running. Farmers said dry soil was blocking autumn planting and warned of shortages. Late rain in August stopped some rainfall records from falling but did not undo the season's heat.

Provisional numbers can move by tenths once late station data are folded in. They do not usually move a record that sits four-tenths above the previous mark. The policy argument will not wait for the final quality-control pass. Two record summers in a row, with 1976 now a mid-table entry, is the fact the Met Office put on the table on the first day of meteorological autumn.

What follows is winter planning and a harvest that grew under stress. The attribution fraction, 130 times, is the number the agency wants read next to 16.5. It is also the number that will be quoted every time a new summer takes the crown, which the present list suggests will not take another 50 years.