El Niño; an alarming news for Finland!

El Niño strengthens: What could it mean for Finland this winter?

A powerful El Niño is developing in the Pacific, with climate agencies warning of an unusually strong event. For Finland, however, the consequences are less straightforward than a simple prediction of a colder or warmer winter.

HELSINKI — A powerful El Niño is gathering strength over the tropical Pacific, raising the prospect of significant changes in global weather patterns through the end of 2026 and into 2027.

According to the U.S. National Oceanic and Atmospheric Administration (NOAA), El Niño strengthened considerably during August. Sea-surface temperature anomalies in the Niño 3.4 region reached +1.8°C, while temperatures in the eastern Pacific were more than 3°C above average in some areas.

NOAA estimates a greater than 90% probability of a very strong El Niño during the Northern Hemisphere autumn and winter of 2026–27. It also puts the probability of an event reaching historic strength during October–December at 75%.

The World Meteorological Organization (WMO) has likewise described the event as firmly established and expects it to persist through at least February 2027. The organisation says the unusually warm Pacific could influence rainfall, temperature and atmospheric circulation patterns around the world.

Finland may see a different story

Despite the strength of the Pacific warming, Finnish weather is not determined by El Niño alone.

The Finnish Meteorological Institute says the influence of El Niño and La Niña on Northern European weather is considerably weaker than their influence in regions such as North America. Other atmospheric factors can easily overwhelm the ENSO signal in Finland.

That means a strong El Niño should not automatically be interpreted as a forecast for a particularly cold or snowy Finnish winter.

El Niño can, however, influence the large-scale atmospheric circulation, including the jet stream and pressure patterns over the North Atlantic and Europe. These changes can affect the frequency and direction of cold-air outbreaks and milder Atlantic air reaching Finland.

In other words, the coming winter could contain pronounced swings between different weather patterns, but El Niño alone cannot determine the final outcome.

Western Europe already showing an El Niño-like pattern

The potential European influence has already attracted attention.

The Finnish Meteorological Institute notes that summer 2026 produced a striking contrast across Europe: western Europe experienced exceptionally high temperatures, while Finland and much of Fennoscandia had a comparatively ordinary summer.

The institute says this east-west contrast is characteristic of the type of atmospheric circulation that can occur during El Niño summers, although it cautions that the influence of El Niño cannot be established as the sole cause of the 2026 European heat.

Persistent high-pressure conditions and changes in the jet stream were major factors behind the exceptional heat in western Europe.

What about the Finnish winter?

For Finland, the key question will be how El Niño interacts with other atmospheric patterns during the winter.

A strong El Niño can alter the jet stream thousands of kilometres away from the Pacific. But Finland's weather is also strongly affected by the North Atlantic Oscillation, Arctic circulation, polar-vortex behaviour and the movement of Atlantic low-pressure systems.

Consequently, the same El Niño event can produce very different weather from one winter to another.

The Finnish Meteorological Institute stresses that the natural variability of European weather is large and that El Niño's influence on Northern Europe is relatively weak.

For Finns, this means that the current El Niño should be viewed as one important background climate signal rather than a direct winter forecast.

A bigger impact may come in 2027

While Finland's winter outlook remains uncertain, the global temperature implications are clearer.

El Niño temporarily releases additional heat into the atmosphere and raises global average temperatures. WMO says the warming influence can continue beyond the peak of the Pacific event and into the following year.

The Finnish Meteorological Institute has previously warned that if the exceptionally strong El Niño develops as forecast, 2027 could potentially become a record-warm year globally.

This does not mean that every country will experience record temperatures throughout 2027. Regional weather can differ considerably from the global average.

But it does mean that the combination of a strong El Niño and an already warming global climate could create an elevated risk of unusual temperature extremes in different parts of the world.

Finland watching the Pacific

For Finland, the immediate message is therefore one of uncertainty rather than a single dramatic winter forecast.

A very strong El Niño is now developing with unusually warm Pacific waters. It could contribute to major changes in atmospheric circulation and influence European weather during the coming months. But whether Finland experiences a predominantly cold, mild, snowy or wet winter will depend on several interacting climate and weather patterns.

What is clear is that the Pacific event is becoming one of the major climate signals to watch as the world moves towards winter 2026–27.

The next few months will show how strongly this extraordinary El Niño reaches into Europe's weather — and whether Finland feels the effects.