Finland: water temperature

At sea, 8.9 °C on average across 19 stations, from 6.1 °C (Kemi Ajos) to 12.1 °C (Suomenlahti (bouée)). In fresh water, 6.7 °C on average across 29 stations, from 2.8 °C (Inari, Nellim (Inarijärvi l. Anarjävri)) to 10.6 °C (Lohjanjärvi).

See on the map

Sea and ocean

Lakes and rivers

Where to swim, month by month

The normal sea temperature each month along the coast: pick a month to see where the water is warmest and whether you can swim.

• January 1.9 °C · up to 3.1 °C
• February 0.9 °C · up to 1.8 °C
• March 0.8 °C · up to 1.6 °C
• April 1.8 °C · up to 3.1 °C
• May 4.9 °C · up to 7.1 °C
• June 11.2 °C · up to 12.9 °C
• July 16.1 °C · up to 17.0 °C
• August 16.8 °C · up to 17.7 °C
• September 14.1 °C · up to 15.2 °C
• October 9.8 °C · up to 11.3 °C
• November 6.6 °C · up to 8.6 °C
• December 3.8 °C · up to 5.2 °C

Warmest water today

Where these numbers come from

Every value is a real reading from an instrument, at its position: a buoy, a wharf, a river or lake station. It keeps the time it was measured. A reading too far from those of nearby stations is marked with a “?”. Between stations, the map gives a satellite or model estimate, always labelled as such.

Sources: Lacs de Finlande, Mer de Finlande. Sources and credits

Nearby

• Sweden 38 stations · sea 10.0 °C
• Latvia 67 stations · sea 9.9 °C · fresh water 9.2 °C
• Lithuania 93 stations · sea 12.5 °C · fresh water 9.7 °C
• Denmark 29 stations · sea 11.4 °C
• Poland 78 stations · sea 10.4 °C · fresh water 9.9 °C
• Czech Republic 258 stations · fresh water 8.5 °C