Lake Ülemiste — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Ülemiste, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Ülemiste today is 14.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| SEP 14 | 15.6°C | 18.0°C | |
| SEP 15 | 15.1°C | 18.0°C | |
| SEP 16 | 15.0°C | 18.0°C | |
| SEP 17 | 14.4°C | 18.0°C | |
| SEP 18 | 14.4°C | 18.0°C | |
| SEP 19 | 14.4°C | 18.0°C | |
| SEP 20 | 14.6°C | 18.0°C | |
| SEP 21 | 14.5°C | 18.0°C | |
| SEP 22 | 18.0°C | 14.7°C | |
| SEP 23 | 18.0°C | 14.9°C | |
| SEP 24 | 18.0°C | 15.0°C | |
| SEP 25 | 18.0°C | 15.2°C | |
| SEP 26 | 18.0°C | 15.4°C | |
| SEP 27 | 18.0°C | 15.6°C | |
| SEP 28 | 18.0°C | 15.7°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 | 16°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 Ülemiste: Water Temperature by Location
Lake Ülemiste: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Ülemiste Lake, Tallinn’s main water reservoir, undergoes clear seasonal changes in surface temperature. In spring the water typically warms from near-freezing to around 2–12 °C (36–54 °F) as ice melts and air temperatures rise. By summer, depending on weather and wind, surface temperatures commonly reach about 16–24 °C (61–75 °F) during the warmest weeks, though cooler or warmer years occur. In autumn the lake cools again to roughly 4–12 °C (39–54 °F) as days shorten, and in winter the surface is often at or close to 0–1 °C (32–34 °F) when ice and cold conditions prevail. Temperature stratification and local conditions can cause variation across the basin.
Swimming in Ülemiste is generally not permitted because the lake serves as Tallinn’s primary source of drinking water and is subject to protection and regulation to safeguard water quality. Restrictions are in place to reduce contamination risks, and authorities discourage entering the water for public-health and supply-security reasons. For those seeking recreation, nearby designated swimming areas and monitored beaches are the recommended alternatives, where water quality is routinely tested and local rules allow bathing.