Viljandi Järv — bathing-water quality and weather
Current conditions
Latest measurements (2026 season)
Latest test: 2026-06-16
E. coli: 60 CFU/100 ml
Enterococci: 90 CFU/100 ml
Assessment: Complies with standards
2 measurements this season — see all
| Date | E. coli | Enterococci | Assessment: |
|---|---|---|---|
| 2026-06-16 | 60 | 90 | Complies with standards |
| 2026-05-19 | 10 | 30 | Complies with standards |
Bathing-water quality
Latest EU monitoring assessment: Excellent (2021–2024)
The EU class is a rolling assessment of the last four bathing seasons; 2021–2024 is the newest published by the EEA. This season's individual samples are shown above.
Quality trend (2014–2024):
Data: EEA Bathing Water Quality (CC-BY 4.0) · Health Board bathing-water monitoring · EEA: EE00505017VILJA
Hourly forecast
7-day forecast
Forecast model comparison
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Beach
Viljandi Järv, located in Viljandi County, is a lake bathing beach. It is practically within the town of Viljandi. The bathing-water status has been at the highest level in all measured years (2012–2022). The Viljandi weather station is 2.0 km away. Bathing-water monitoring is carried out under the EU Bathing Water Directive (Health Board).
Local climate
| Month | Avg °C | Avg high °C | Avg low °C | Precip mm |
|---|---|---|---|---|
| Jan | -4.1 | -2.1 | -6.3 | 48.3 |
| Feb | -4.6 | -2.3 | -7.2 | 46.7 |
| Mar | -1.1 | 2.2 | -4.4 | 39.1 |
| Apr | 5.4 | 9.7 | 1.0 | 43.4 |
| May | 11.1 | 15.4 | 6.3 | 54.5 |
| Jun | 15.7 | 19.6 | 11.3 | 86.4 |
| Jul | 18.2 | 21.8 | 14.0 | 80.3 |
| Aug | 16.9 | 20.5 | 13.3 | 91.1 |
| Sep | 12.2 | 15.4 | 9.1 | 57.5 |
| Oct | 6.5 | 8.9 | 4.1 | 69.5 |
| Nov | 1.7 | 3.4 | -0.1 | 57.4 |
| Dec | -2.2 | -0.4 | -4.2 | 50.5 |
Frequently asked questions
What is the bathing-water quality?
The latest Health Board bathing-water measurement (2026-06-16): E. coli 60 CFU/100 ml, enterococci 90 CFU/100 ml. EU Bathing Water Directive long-term classification: excellent.
When is the best time to swim?
The swimming season usually lasts from early June to late August. The warmest month, July, averages 18.2°C, and the water is warmest in the second half of July.
How warm is the water in summer?
Lake water usually warms to 18–22 °C in midsummer, and more in shallow shoreline water. You can see the current water temperature on puhub's water layer.
Is Viljandi Järv a safe place to swim?
Viljandi Järv is an official, EEA-registered bathing beach whose water is monitored by the Health Board. There may not be a permanent lifeguard, so swim in the marked area and watch the weather.