Lake Harku — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Harku, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Harku today is 21.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUL 15 | 20.4°C | 21.8°C | |
| JUL 16 | 20.9°C | 21.8°C | |
| JUL 17 | 20.9°C | 21.8°C | |
| JUL 18 | 21.0°C | 21.8°C | |
| JUL 19 | 21.3°C | 21.8°C | |
| JUL 20 | 21.8°C | 21.8°C | |
| JUL 21 | 21.9°C | 21.8°C | |
| JUL 23 | 21.8°C | 21.8°C | |
| JUL 24 | 21.8°C | 21.8°C | |
| JUL 25 | 21.8°C | 21.8°C | |
| JUL 26 | 21.8°C | 21.8°C | |
| JUL 27 | 21.8°C | 21.8°C | |
| JUL 28 | 21.8°C | 21.8°C | |
| JUL 29 | 21.8°C | 21.8°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 7°C |
| April | 4°C | 8°C | 11°C |
| May | 7°C | 12°C | 18°C |
| June | 13°C | 19°C | 24°C |
| July | 16°C | 22°C | 27°C |
| August | 17°C | 22°C | 27°C |
| September | 12°C | 18°C | 23°C |
| October | 7°C | 11°C | 14°C |
| November | 2°C | 6°C | 10°C |
| December | 0°C | 4°C | 7°C |
Lake Harku: Water Temperature by Location
Lake Harku: Weather Forecast
July 22
July 23
July 24
July 25
Location & Local Information
Lake Harku (Harku järv) is a relatively shallow recreational lake near Tallinn, so its water temperatures fluctuate with the seasons. In winter the surface is typically at or around 0 °C (32 °F) and the lake often forms stable ice. During spring the water commonly warms from about 2 to 10 °C (36 to 50 °F) as snowmelt and cool inflows dominate. Summer is when the lake is warmest, with typical bathing temperatures in the range of 15 to 24 °C (59 to 75 °F), occasionally reaching the mid‑20s on hot spells. In autumn the water cools again, generally dropping through roughly 5 to 12 °C (41 to 54 °F) before freezing resumes.
Swimming is permitted and the lake is used for bathing and informal recreation at designated access points, but conditions vary and authorities monitor water quality. Recreational access is allowed because public beaches and shoreline areas exist, yet occasional algal blooms or elevated bacterial counts can prompt temporary advisories or closures to protect health. In winter, ice swimming occurs when ice thickness and safety have been confirmed. Visitors should follow local guidance and posted notices about water quality and safety before entering the water.