ast month was the UK’s joint warmest September on file, provisional figures present.
The typical imply temperature throughout the nation was 15.2C, equalling the earlier file set in 2006 – one thing that might have been “virtually not possible” with out human-led climate change, the Met Office stated.
It means 5 of the highest 10 warmest Septembers have taken place this century.
A heatwave affected a lot of the UK early within the month, with temperatures peaking at 33.2C at Kew Gardens in London on September 9 – the most well liked day of the 12 months.
A change within the weather within the second half of September noticed storm Agnes deliver robust winds and heavy rain to components of the nation, which means the month ended up wetter than common.
Met Workplace scientific supervisor Mark McCarthy stated: “This September’s temperature information are closely pushed by how considerably heat the primary half of the month was.
“Not solely did September have the most well liked day of the 12 months – one thing that has solely occurred on 4 earlier events in our observations – nevertheless it additionally had seven consecutive days the place temperatures had been above 30C someplace within the UK, which had by no means occurred on this month in Met Workplace observations.
“The considerably heat begin to September was influenced by excessive stress throughout Europe. This helped to attract hotter air over the UK at first of the month.”
The Met Workplace provisional figures present England and Wales each noticed their warmest September on file, with imply temperatures of 16.7C and 15.6C respectively, whereas Northern Eire had its joint warmest (14.2C) and Scotland its third warmest (12.8C).
Complete rainfall for the entire of the UK was 31% above the long-term common, although this sample was not the identical throughout all components of the nation, with areas of East Anglia and south-east England recording much less rain than typical for the month.
Together with 2006 and 2023, the UK’s prime 10 warmest Septembers additionally contains 2021 (14.7C), 2016 (14.6C) and 2014 (13.9C).
Met Workplace temperature information start in 1884.
In a pre-industrial local weather these temperatures would have been practically not possible for the UK in September
A imply temperature of 15.2C for September can be have been “virtually not possible in a local weather with out human-induced greenhouse gasoline emissions”, in response to Met Workplace senior scientist Jennifer Pirret.
Analysis carried out by the organisation’s climate and local weather extremes impacts crew discovered that within the present local weather, the place world temperatures have risen by round 1.1C because the industrial revolution, there’s now a 3% probability in a given 12 months of the imply September temperature reaching or exceeding 15.2C.
“Whereas a 3% probability may appear to be a small quantity, in a pre-industrial local weather these temperatures would have been practically not possible for the UK in September,” Ms Pirret added.
“It reveals how local weather change is shifting the dial on imply temperatures. This September’s temperatures are nonetheless unlikely and wanted the correct mixture of large-scale situations and climate patterns, however local weather change has helped to make it attainable.
“As world temperatures proceed to rise on account of human greenhouse gasoline emissions, we anticipate these possibilities to extend over the approaching many years, although the pure year-to-year variability of the UK local weather will clearly proceed to play a task.”