Overview
- The UK could face an increased risk of snow and freezing temperatures later in winter 2026-2027 if El Niño contributes to disruption of the polar vortex, although widespread snowfall is not guaranteed.
- El Niño is more likely to bring mild, wet and potentially stormy conditions during autumn, with the possibility of colder weather increasing later in winter.
- The Met Office has warned about potential polar vortex disruption, while the UK government and British Gas recommend emergency supplies and preparations for severe winter weather.
The UK could experience colder weather and an increased risk of snow during winter 2026-2027 as a developing El Niño influences atmospheric conditions, although forecasts of widespread snowfall caused by a disrupted polar vortex remain uncertain.
Recent reports have suggested that a powerful polar vortex could bring severe freezing conditions towards the end of 2026. The relationship between El Niño, the polar vortex and British winter weather is more complicated, however, and does not guarantee a prolonged cold spell.
For the remainder of autumn, El Niño generally increases the likelihood of mild, wet and potentially stormy weather across the UK. Its influence could change later in winter, when atmospheric conditions may become more favorable for colder northerly and easterly winds.
What is the polar vortex and how does it affect UK weather?
The polar vortex is a ring of strong westerly winds that forms around the North Pole during winter, approximately 10-30 miles (16-48 km) above the Earth’s surface.
It develops as air over the Arctic becomes extremely cold and dense. The temperature difference between the polar region and warmer areas farther south drives powerful winds in the stratosphere.
A strong polar vortex generally supports a strong polar jet stream lower in the atmosphere, helping weather systems move from west to east. For the UK, this often means relatively mild Atlantic air, accompanied by periods of wind and rain, while the coldest Arctic air remains farther north.
The situation can change when the polar vortex weakens, shifts position or reverses direction.
Such disruptions can influence the jet stream over subsequent days and weeks, causing it to weaken or follow a more pronounced north-south pattern. This can allow cold Arctic or continental air to reach the UK, increasing the potential for snow and freezing temperatures.
A disruption does not automatically produce colder conditions at ground level. Severe winter weather can also develop without significant changes to the polar vortex.
How El Niño could influence the UK winter
El Niño is a naturally occurring climate phenomenon involving unusually warm waters in the tropical Pacific Ocean. Heat transferred from the ocean into the atmosphere affects weather patterns around the world.
The current El Niño has continued to strengthen and, by some measures cited in reports, has reached record intensity. During autumn, El Niño tends to increase the probability of unsettled weather in the UK, including heavy rainfall and Atlantic storms.
Later in winter, atmospheric waves associated with El Niño can travel into the stratosphere and increase the likelihood of polar vortex disruption. This may create conditions favorable for colder weather and snowfall across parts of Britain.
A Met Office spokesperson said: “Through the latter part of the winter, following a peak in El Niño, the stratospheric Polar Vortex can become weaker, leading to an increased chance of Sudden Stratospheric Warming (SSW) events unfurling, increasing the potential for cold weather.”
Sudden stratospheric warming events involve rapid temperature increases high above the Arctic, generally around 10–50 km above the Earth’s surface. They can weaken or reverse stratospheric winds and subsequently disrupt the jet stream, potentially allowing colder air to reach the UK.
The connection remains variable, and historical weather patterns illustrate why El Niño alone cannot reliably predict a severe winter.
The winter of 2009-2010, known as the Big Freeze, was the UK’s coldest in three decades at the time and coincided with an El Niño event.
The winter of 2006-2007 also occurred during El Niño conditions but was unusually warm.
Meanwhile, the Beast from the East in 2018 brought widespread snow and freezing temperatures during a La Niña period, the opposite phase of El Niño.
These examples show that other atmospheric conditions can substantially influence the outcome of a particular winter.
UK government and British Gas recommend winter preparations
Amid forecasts of potentially unsettled and colder weather, the UK government and British Gas have encouraged households to prepare for emergencies.
The government has updated and expanded its existing Prepare Campaign guidance, recommending that households keep at least three days’ worth of essential supplies in an accessible location.
Suggested emergency items include drinking water, non-perishable food, essential medication, additional blankets, torches and batteries.
Households are also advised to develop an emergency plan, including an agreed meeting place if family members are unable to return home during severe weather.
British Gas has published its own winter preparation checklist, recommending practical measures such as sealing gaps around doors and windows and insulating exposed water pipes.
These recommendations are precautionary and do not establish that a particular snowstorm or prolonged freeze will occur.
The Met Office continues to emphasize that El Niño is only one of several factors affecting UK weather. Although a weakening polar vortex could increase the likelihood of cold conditions later in winter, the extent, timing and geographical distribution of any snowfall cannot yet be determined with confidence.
For now, the stronger seasonal signal is for unsettled autumn weather, with the possibility of a colder period emerging later in winter if atmospheric conditions develop accordingly.
