UK Braces for Late September Warmth Before Atlantic Storm Brings Wind and Rain

A large area of low pressure developing over the Atlantic is set to pull warm southerly and south-easterly winds across the United Kingdom in the early part of this week, delivering a final taste of summer warmth before more autumnal conditions take hold. According to BBC Weather, Tuesday is expected to be the warmest day of the spell, with temperatures climbing well above average for late September. However, forecasters warn that rain will not be far behind, as an approaching depression threatens to sweep wet and windy weather across much of the country from midweek onwards.

The weather pattern is being driven by a deep area of low pressure sitting out in the Atlantic Ocean. This system is drawing warm air northwards from Iberia and France, creating a southerly airflow that will raise temperatures significantly, particularly across England and Wales. The BBC Weather team, led by lead presenter Helen Willetts, has described the setup as a classic example of how Atlantic weather systems can briefly import summery conditions to the UK even as the season officially shifts toward autumn.

Monday will begin on a notably chilly note despite the warmth that follows. Because the autumn equinox occurred last week, nights are now longer than days across the UK, meaning clear skies overnight allow heat to escape rapidly from the ground. Commuters should be prepared for some fog patches during the morning rush hour, particularly in rural and low-lying areas. Once any fog clears, however, many parts of the country can expect a brighter day, with high pressure bringing sunny spells and only a few scattered showers. South-east England may receive some much-needed rain during the afternoon and evening, although forecasters stress that this is by no means guaranteed. Temperatures on Monday are expected to range from the mid to high teens, with some southern areas possibly reaching 20C.

Tuesday represents the peak of this warm spell. A strengthening southerly wind will usher in significantly higher temperatures, with Scotland and Northern Ireland forecast to reach the high teens, while England and Wales could see the mercury climb to between 20C and 26C. For a country that has already experienced its hottest summer on record, this late-September warmth serves as a reminder of how unusual the broader climate pattern has been this year. The warmth will not last, however, as rain is expected to move into Northern Ireland during Tuesday afternoon before gradually spreading eastwards through the evening and overnight period.

That rain band may become persistent and occasionally heavy as it crosses the Irish Sea and moves into western parts of Great Britain. Strong winds are also expected, with gales possible for exposed coasts and hills, particularly in Scotland, Northern Ireland, and western England and Wales. These are the regions most likely to bear the brunt of the unsettled conditions associated with the Atlantic depression. Coastal communities should be prepared for potentially disruptive wind and rain, while those further inland may escape the worst of the weather.

For many central, southern, and eastern areas of England, however, the picture is rather different. These regions, many of which have been officially affected by drought, are expected to see far less rainfall than their western counterparts. The rain may not arrive until Wednesday, and even then it could linger only briefly overnight. This uneven distribution of rainfall highlights the stark north-west to south-east contrast that has characterised September's weather across the UK, a pattern that has persisted for much of the month.

Wednesday's conditions will see a return to sunny spells and scattered showers once the main rain band has cleared. It will remain windy in the west, while eastern areas may enjoy somewhat calmer conditions. By Thursday, forecasters expect high pressure to begin building back across the country, bringing calmer and drier weather for most. By Friday, any remaining showers are likely to become confined to north-western regions, leaving the rest of the UK under relatively settled conditions.

The contrast in rainfall across the UK this September has been dramatic. Following the hottest summer on record, September has continued to be notably warm for many, but it has also exposed a sharp divide between the wet north-west and the parched south-east. Scotland and other western areas have repeatedly been hit by Atlantic weather systems carrying rain and wind, while much of central, southern, and eastern England has remained largely dry with abundant sunshine. As a result, rainfall totals have varied enormously from region to region.

Some drought-affected parts of England have received very little rain at all this month, while parts of north-west Scotland have been exceptionally wet. According to BBC Weather, locations including Kirkwall and Prestwick have already recorded nearly one and a half times their average September rainfall. At Achnagart in the Highlands, rain has fallen every single day for the past 27 days, a remarkable statistic that underscores just how persistent the wet weather has been in that part of the country. Parts of Northern Ireland and Wales have received roughly their average rainfall, while north-east England has seen some of the lowest amounts so far.

The implications of this divided weather pattern are significant. For drought-affected regions in the south and east, the incoming rain may provide only limited relief. Research cited by BBC Weather suggests that at least seven months of relentless rain would be needed to fully end the drought in those areas. This means that even if the coming week delivers some welcome precipitation, it will not be enough to reverse the long-term deficits that have built up over the summer and early autumn.

Looking ahead, forecasters caution that details may change as the week progresses. Weather systems over the Atlantic can shift course and intensity, meaning the exact timing and location of rain and wind could differ from current projections. The BBC Weather team advises the public to stay up to date with short-term forecasts for their local area, particularly if they have travel plans or outdoor activities scheduled for Tuesday and Wednesday. The warmth will be brief, but it offers a final opportunity to enjoy some late-season sunshine before autumn fully asserts itself.