The unusually warm early autumn weather is raising lake temperatures across Finland.
Lake temperatures are now significantly higher than usual for this time of year, according to Merja Pulkkanen at the Finnish Environment Institute (Syke).
Surface water temperatures are some 18–20 degrees Celsius in southern areas, around 16–18 degrees in central parts and between 12–15 degrees in Lapland, Pulkkanen told Finnish news agency STT.
Finland's sea areas are also experiencing warmer-than-usual conditions. According to marine expert Anni Jokiniemi from the Finnish Meteorological Institute (FMI), surface water temperatures range between 15 and 20 degrees.
This week Finland's record for 'hot' days was broken after temperatures breached the official 'heatwave' threshold of 25 degrees Celsius on Friday for the 67th time this year.
Temperatures in Finland during July were also higher than normal, with central and northern parts of the country "exceptionally warm", according to data released by the FMI.
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