How El Niño Affects the UK and Europe: Winter Storms, Flooding, and the 2026-27 Outlook

Published: July 16, 2026 · 10 min read

TL;DR — El Niño's European Signature

El Niño's influence on Europe is weaker and less consistent than its effects on the tropics, but during very strong events the signal becomes clear. The main effects for the UK and Europe during strong El Niño winters: a southward-shifted and strengthened North Atlantic jet stream that steers more frequent and intense winter storms toward the British Isles and western Europe; above-normal winter temperatures across northern Europe (Scandinavia, the Baltics, northern Germany, Poland); wetter-than-normal conditions in southern Europe (Iberia, the Mediterranean coast, the Balkans); and a variable Alpine snowpack — good early-season snow in the southern Alps, less reliable snow in the northern Alps. The 1997-98 and 2015-16 El Niños both produced notably stormy UK winters with repeated flooding events. The 2023-24 El Niño contributed to a very wet winter across the UK and Ireland, with Storms Babet, Ciarán, and Henk causing widespread damage. The 2026-27 very strong El Niño forecast suggests elevated winter storm risk for the UK.

How El Niño Reaches Europe: The Teleconnection Pathway

Europe is far from the tropical Pacific, so El Niño doesn't directly affect European weather the way it affects Australia or the Americas. Instead, the effect comes through a chain of atmospheric connections called teleconnections.

The chain works like this: El Niño's warm tropical Pacific waters alter the strength and position of the subtropical jet stream over the Pacific. This change modifies the position of the North Pacific Aleutian Low, which in turn affects the Rossby wave pattern across North America and the North Atlantic. During strong El Niño events, this chain consistently shifts the North Atlantic jet stream southward and intensifies it — and a stronger, southerly-displaced jet means more winter storms hitting the UK, Ireland, and western Europe.

This connection is most reliable during strong El Niño events (Niño-3.4 anomaly above +1.5°C). During weaker events, the European signal can be masked by other climate drivers like the Arctic Oscillation, the North Atlantic Oscillation, and the stratospheric polar vortex. For the 2026-27 event, forecast as very strong, the European signal is expected to be clear.

The United Kingdom and Ireland: Storm Central

The UK and Ireland sit directly in the path of the enhanced El Niño jet stream. The result during strong events is a winter defined by repeated storm systems arriving from the Atlantic, bringing heavy rain, strong winds, coastal storm surges, and inland flooding.

Winter storms: During the 2015-16 El Niño winter, the UK was hit by Storm Desmond (December 2015), which dumped a month's worth of rain in 24 hours across Cumbria and Lancashire, causing devastating floods in Carlisle and the Lake District. Storm Frank followed in late December, and Storm Gertrude in January 2016. The 2023-24 El Niño winter produced a similar pattern: Storms Babet (October), Ciarán (November), and Henk (January) brought widespread flooding across England, Scotland, and Wales.

Flooding: The UK's flood risk during El Niño winters isn't just from individual extreme storms. The pattern of repeated storms over weeks and months means the ground never dries out between events. Saturated soils lead to surface water flooding, river flooding, and groundwater flooding — each successive storm causing more damage than the last because the landscape is already waterlogged. The Somerset Levels, the Thames Valley, the Severn catchment, and parts of Yorkshire and Cumbria are particularly vulnerable.

Coastal impacts: Strong El Niño winters bring elevated coastal flood risk around the UK and Irish coasts. The combination of more frequent and intense storms, storm surges, and higher sea levels (from the global sea level rise that El Niño accelerates) means coastal defences face repeated testing. Coastal communities in eastern England (Norfolk, Suffolk, Essex), the Severn Estuary, and the Irish Sea coast are at elevated risk.

Temperature: UK winters during strong El Niño events are typically milder than average. The southerly jet stream pulls milder Atlantic air over the British Isles. Snowfall is less frequent in lowland areas — the UK gets more rain than snow during El Niño winters, which is good news for travel disruption but bad news for water resource management (snowpack in upland areas acts as a natural reservoir).

Northern Europe: Milder Winters, Less Snow

Scandinavia, the Baltics, northern Germany, and Poland experience El Niño's most consistent European effect: above-normal winter temperatures. During strong events, the southward-shifted jet stream means the cold Arctic air stays further north, and Scandinavia sits in a warmer southwesterly flow.

For Stockholm, Oslo, Helsinki, and Copenhagen, strong El Niño winters typically bring temperatures 1-3°C above the norm. The Baltic Sea ice extent is reduced. Snowfall in coastal lowland areas is below normal, while the Scandinavian mountains (the Norway-Sweden border range) can still receive significant snowfall when individual storms tap into Atlantic moisture.

For winter tourism in Scandinavia, the signal is mixed: northern Sweden and Finland (Lapland) still reliably get snow, and the warmer temperatures actually make outdoor activities more comfortable. But lower-elevation ski resorts in southern Norway and Sweden face less reliable conditions.

Southern Europe: Wetter Conditions, Agricultural Impacts

Iberia (Spain and Portugal), southern France, Italy, and the western Balkans tend to receive above-normal winter rainfall during strong El Niño events. The southward-shifted and strengthened jet stream directs more Atlantic storm systems into this region, breaking the typical Mediterranean winter pattern of long dry spells punctuated by occasional storms.

For Spain and Portugal, this is both good and bad news. Good: El Niño winters help replenish reservoirs after dry summers, reduce wildfire risk, and benefit winter crops like wheat and barley. Bad: excessive winter rainfall can cause flooding and soil erosion, and can damage the olive harvest if the rain arrives too early or too concentrated.

The 2023-24 El Niño winter produced very wet conditions across Spain, with Valencia and the Balearic Islands experiencing severe flooding. Portugal's Tagus River basin flooded in multiple months. For the 2026-27 El Niño, southern Europe should prepare for above-normal winter rainfall and the associated flood risk.

The Alps: Variable Snowpack

The Alpine snowpack during El Niño winters is a complex story. The southern Alps (Italian side, Dolomites) tend to get above-normal snowfall during strong events, as the southward-stalled jet stream pushes Atlantic storms further into the Mediterranean, where they pick up moisture and then dump snow as they hit the Alps' southern slopes. The northern Alps (Swiss, Austrian, French sides) have a weaker, less consistent signal — snowpack can be near-normal or below-normal depending on the exact storm track.

The key risk for Alpine winter tourism during strong El Niño events is not a snow drought but instability. Warmer-than-normal temperatures at low and mid-elevations (below 1,500m) can produce rain instead of snow in the valleys, hurting lower resorts. Above 1,800-2,000m, snowfall is typically adequate. The 1997-98 El Niño produced excellent conditions in the Italian Alps while Austrian and Swiss low-elevation resorts struggled with rain at valley level.

2026-27 Winter Outlook for the UK and Europe

With the forecast very strong El Niño conditions, here's what each European region should expect:

For a broader European overview, see Does El Niño Affect Europe?. For the global winter outlook, see El Niño Winter 2026-2027 Forecast.

Explore more at the El Niño Guide — comprehensive climate science explained.

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