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 19.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| JUN 23 | 17.3°C | 19.0°C | |
| JUN 24 | 18.0°C | 19.0°C | |
| JUN 25 | 17.9°C | 19.0°C | |
| JUN 26 | 17.5°C | 19.0°C | |
| JUN 27 | 17.3°C | 19.0°C | |
| JUN 28 | 17.8°C | 19.0°C | |
| JUN 29 | 18.6°C | 19.0°C | |
| JUN 30 | 19.0°C | 19.0°C | |
| JUL 1 | 22.0°C | 19.3°C | |
| JUL 2 | 22.0°C | 19.5°C | |
| JUL 3 | 22.0°C | 19.6°C | |
| JUL 4 | 22.0°C | 19.8°C | |
| JUL 5 | 22.0°C | 19.9°C | |
| JUL 6 | 22.0°C | 20.0°C | |
| JUL 7 | 22.0°C | 20.2°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 | 17°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
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July 4
July 5
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.