September 2025 will go down as a tail of two halves. A highly zonal, Atlantic low pressure dominated first half followed by cooler, drier, higher pressure dominated 2nd half.
As predicted, a wet month with average to below average temps for much of UK/Ireland.
Global temp & precip anomaly for September 2025
Europe
UK Highlights/Stats
Wet September to start meteorological autumn
Met Office Article
September 2025 was a wet month for much of the UK, though not enough to trouble any longstanding records, according to provisional Met Office statistics.
After the hottest summer on record with below-average rainfall and areas reaching drought status, meteorological autumn has started with a wet month and temperatures around average for many.
Wet September for many
The UK provisionally saw 32% more rain than the long-term average in September, with a large swathe of England, Wales and Northern Ireland seeing generally seeing the wetter conditions.
Of the UK’s nations, Scotland was slightly drier, though even here still saw slightly above average rainfall, with 125.8mm or 2% more than the long-term average.
In contrast, Wales was the wettest nation in the month and had 74% more rain than average.
England and Northern Ireland also saw above average rainfall, with 102.0mm (49% more than average) and 144.6mm (65% more than average) of rain respectively. At a county level, Cumbria had its fourth wettest September in a series from 1836, and its wettest since 1950.
Dr Emily Carlisle is a scientist at the Met Office. She said: “In a change from recent months, September brought frequent rain as a succession of low pressure systems brought frontal rain across the country for the first few weeks of the month. We’ve also seen some heavy downpours at times from thunderstorms.
“While there have been drier interludes at times, not least further south in recent days, September 2025 goes down as a wet month, with temperatures and sunshine hours generally closer to average.”
Average temperatures for many
The average mean temperature for September 2025 was provisionally 12.8°C, which is slightly below the long-term meteorological average.
England, Wales, Scotland and Northern Ireland were all fractions of a degree from their long-term average mean temperature. Only the Northern Isles were significantly warmer than average.
The UK’s highest daily maximum temperature during September 2025 was 27.8°C, with the lowest overnight minimum temperature of -5.0°C giving a flavour of the variable conditions that are possible in a UK autumn.
Above average sunshine
The vast majority of the UK had above average amounts of sunshine through the month, though to varying degrees.
With 140.3 hours of sunshine, the UK provisionally saw 10% more sunshine than average, with England and Scotland also seeing above average sunshine amounts.
Wales and Northern Ireland saw sunshine hours very slightly below their respective long-term averages for the month.
The sunniest skies compared to average were reserved for those further north, with northern Scotland particularly sunny, though not enough to get close to any national records.
9 Out of 10: A Good September Forecast
The Verdict…
Cooler, wetter, more unsettled first half with drier, more settled second half for MUCH of UK & Ireland. Average to below average temperatures. Warmer, drier Iberia, France, Italy into E/SE Europe
September Figures Across The Country
(Courtesy Reading University)
September 2025 Monthly Weather Report
Highest Maximum 27.8°C on 19th at London, St James’s Park (Greater London, 5mAMSL)
Lowest Maximum 8.3°C on 21st at Tomintoul No 6 (Banffshire, 320mAMSL)
Highest Minimum 18.5°C on 7th at Swanage (Dorset, 10mAMSL)
Lowest Minimum -5.0°C on 29th at Tomintoul No 6 (Banffshire, 320mAMSL)
Lowest Grass
Minimum -6.6°C on 29th at Tomintoul No 6 (Banffshire, 320mAMSL)
Most Rainfall 87.8mm on 11th at Achnagart (Ross & Cromarty, 15mAMSL)
Most Sunshine 11.7hr on 5th at Shoeburyness, Landwick (Essex, 2mAMSL)
Highest Gust 68Kt 78mph on 14th at Wight: Needles Old Battery (Isle Of Wight, 80mAMSL)
Highest Gust
(mountain*) 88Kt 101mph on 18th at Cairngorm Summit (Inverness-shire, 1237mAMSL)
Greatest Snow
Depth at 0900
UTC
No non-zero values.
My September 2025 Stats
Summary/Highlights
A variable month with 21.5C being the lowest of my three September max temps. Two nights recorded a min temp lower than my previous lowest for September with 1.2C and 0.8C respectively. (previous 1.5C in 2023). It was my driest September. Previous driest being 63.00mm in 2024.
Global Highlights For September 2025
Full Credit for below Stats/Info: Extreme Temperatures Around The World, Thierry Goose, Milos Milic,
NEW 24-HOUR RAIN RECORD FOR IBIZA BELOW
Real Weather-Whiplash to Close September…
Unusually cold late September 5-day period for much of Iberia and France following a hot spell 5-days previous.
16-21st (Widely 4-7C above average)
21-26th (Widely 4-6C below average)
Remnants of Hurricane Gabrielle brought significant flooding rains to both west and east Iberia and Balearics after sweeping through the Azores 36-48 hours previous.
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