El Niño and the polar vortex: will the UK see snow this winter?

A developing El Niño event could influence the UK's weather prospects over the coming autumn and winter, according to meteorologists, though they caution that cold conditions and snow are far from certain.

El Niño is a natural climate pattern associated with the warming of sea surface temperatures in the central and eastern tropical Pacific Ocean. It occurs periodically and can have knock-on effects on weather patterns across the globe, including in Europe, though its influence on any single country's winter can be complex and is rarely the only factor at play.

Alongside El Niño, forecasters also look to the state of the polar vortex — a band of strong winds that circles high in the atmosphere above the Arctic — as a key influence on whether cold air spills south into the UK during winter months. A weakened or disrupted polar vortex has historically been linked to spells of unusually cold weather in the UK.

Despite the presence of these two factors this year, meteorologists stress that neither El Niño nor the state of the polar vortex can reliably guarantee a particular winter outcome on their own. Long-range seasonal forecasting remains subject to significant uncertainty, and the UK's winter weather is shaped by a range of interacting atmospheric and oceanic conditions.

As a result, while the ingredients for a colder, snowier winter are being watched closely, forecasters are not yet in a position to say with confidence whether the UK will see significant snowfall this winter.