Maardu Järv — bathing-water quality and weather
Bathing-water quality
Latest EU monitoring assessment: Excellent (2022)
10-year quality trend (2012–2022):
Data: EEA Bathing Water Quality (CC-BY 4.0) · Health Board bathing-water monitoring · EEA: EE00101023MAARDU
5-day forecast
Hourly forecast
Latest measurements (2025 season)
Latest test: 2025-08-15
E. coli: <10 CFU/100 ml
Enterococci: <30 CFU/100 ml
Assessment: Vastab normile
6 measurements this season — see all
| Date | E. coli | Enterococci | Assessment: |
|---|---|---|---|
| 2025-08-15 | <10 | <30 | Vastab normile |
| 2025-08-01 | <30 | 50 | Vastab normile |
| 2025-07-18 | 170 | 50 | Vastab normile |
| 2025-07-04 | 70 | 30 | Vastab normile |
| 2025-06-09 | <30 | <10 | Vastab normile |
| 2025-05-16 | <30 | <30 | Vastab normile |
Beach
Maardu Järv is a lake in Harjumaa with an official swimming beach. It lies 4 km south-west of the town of Maardu. Water quality is mostly excellent or good (11 monitoring years). The nearest weather station is Kloostrimetsa, 6.7 km away. Official monitoring: the Health Board, EU Bathing Water Directive (2006/7/EC).
- Coordinates: 59,4505° N, 24,9947° E
- County: Harju County
- Bathing-site type: lake water
Local climate
| Month | Avg °C | Avg high °C | Avg low °C | Precip mm |
|---|---|---|---|---|
| Jan | -3.7 | -1.8 | -5.8 | 43.9 |
| Feb | -4.3 | -2.0 | -6.7 | 39.9 |
| Mar | -1.2 | 1.8 | -4.2 | 32.9 |
| Apr | 4.7 | 8.7 | 0.7 | 38.0 |
| May | 10.3 | 14.4 | 5.8 | 45.2 |
| Jun | 15.2 | 18.9 | 11.0 | 69.0 |
| Jul | 18.0 | 21.5 | 14.3 | 70.0 |
| Aug | 17.0 | 20.3 | 13.7 | 76.1 |
| Sep | 12.4 | 15.3 | 9.7 | 59.2 |
| Oct | 6.8 | 8.9 | 4.8 | 64.0 |
| Nov | 2.2 | 3.7 | 0.5 | 54.6 |
| Dec | -1.7 | 0.0 | -3.6 | 49.2 |
Frequently asked questions
What is the bathing-water quality?
The latest Health Board bathing-water measurement (2025-08-15): E. coli <10 CFU/100 ml, enterococci <30 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 18.0°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 Maardu Järv a safe place to swim?
Maardu 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.