Meteorologists recorded a high temperature of 25.2 degrees Celsius (77 F) in the eastern town of Lappeenranta, marking the city's 40th 'hot' day this year, according to Yle forecaster Anne Borgström.
The average temperature throughout the country in June was 16.5 degrees, beating the previous high of 16.2 degrees set in 1953.
Finland’s sizzling temperatures will drop down to around 20 degrees Celsius next week.
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