Study: Climate Change Made Nordic Heatwave 10 Times More Likely

AUG 15 2025·Updated SEP 23 2025

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Above: The Ounaskoski Beach at the Arctic Circle in Rovaniemi on July 23. Image credit: Jouni Porsanger/AFP/Getty Images

The Facts

According to a study published by World Weather Attribution on Thursday, the intense heatwave experienced for two weeks from mid-July by Finland, Norway, and Sweden was made ten times more likely by climate change. During the period, temperatures repeatedly exceeded 30°C.
World Weather Attribution
The Standard
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Finland recorded temperatures above 30°C on 22 consecutive days, marking the country's longest heatwave on record. Meanwhile, Norway's Namsskogan and Gartland saw temperatures reach 30°C for 13 consecutive days.
EuroNews
World Weather Attribution
At least 67 drowning deaths occurred across the three countries during the heatwave, with 28 fatalities in Finland, 31 in Sweden, and 8 in Norway in July, as people sought relief from the high temperatures.
The Guardian
World Weather Attribution
Healthcare systems experienced significant strain, with overcrowded hospitals, overheated buildings, and some facilities forced to cancel planned surgeries due to the conditions.
EuroNews
The Guardian
The Standard
Reindeer were observed entering towns in search of shade and water, with some animals reportedly dying from heat stress, threatening the traditional livelihoods of Indigenous Sami communities who have herded reindeer for over 1,000 years.
EuroNews
World Weather Attribution
The Independent
The extreme heat also created favorable conditions for numerous wildfires across the region and led to extensive algal blooms in the Baltic Sea and Finnish lakes, primarily due to elevated water temperatures.
The Guardian
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The Spin

Climate-concerned narrative

This heatwave proves that climate change is an immediate threat requiring urgent action. The burning of fossil fuels made this event 10 times more likely and 2°C hotter than it would have been naturally. If we don't stop filling the atmosphere with planet-heating gases, such extreme events will become five times more frequent by 2100.

Earth.Org

The Guardian

Climate-skeptic narrative

The recent Nordic heatwave, although unusual, does not conclusively prove a link to climate change. Climate has always fluctuated, and regional weather extremes can occur naturally. Attribution studies rely on models with assumptions that remain debated. One heat wave is not definitive evidence of a global trend and correlation does not necessarily imply causation.

The Heartland Institute

Climate Discussion Nexus

SpringerLink