Finland could see 40°C temperatures by 2100, says meteorologist

Finland’s summer climate may warm by an average of 3°C over the next century, making 40°C temperatures theoretically possible by 2100, Yle meteorologist Aleksi Lohtander said in a Q&A session.

Current heatwaves are linked to a blocking high-pressure system forming an omega (Ω) pattern, which traps hot air over large areas. While natural variation remains, climate change increases the likelihood of prolonged and intense heatwaves, Lohtander noted.

Finland’s longest heatwave on record—defined as temperatures above 25°C—lasted 31 days in Kouvola in 2021. For temperatures above 30°C, the longest streak was 10 consecutive days in Inari in 1972, with 22 days above 30°C recorded somewhere in Finland last year.

To cope with heat, Lohtander advised keeping indoor spaces cool by closing curtains during the day and ventilating at night, taking cool showers, staying hydrated, and seeking air-conditioned spaces when possible.