Jääsjärvi, Hartola · Lake
The current water temperature at Jääsjärvi is 17.8 °C (as of July 23, 2026, source: official monitoring networks).
Can you swim at Jääsjärvi right now?
The current water temperature is 17.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Jääsjärvi?
Currently 17.8 °C (updated continuously).