Lake Viljandi — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Viljandi, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Viljandi today is 14.7°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 | 16.0°C | 17.0°C | |
| SEP 15 | 15.6°C | 17.0°C | |
| SEP 16 | 15.5°C | 17.0°C | |
| SEP 17 | 15.1°C | 17.0°C | |
| SEP 18 | 15.0°C | 17.0°C | |
| SEP 19 | 15.1°C | 17.0°C | |
| SEP 20 | 14.9°C | 17.0°C | |
| SEP 21 | 14.7°C | 17.0°C | |
| SEP 22 | 17.0°C | 14.8°C | |
| SEP 23 | 17.0°C | 14.9°C | |
| SEP 24 | 17.0°C | 15.0°C | |
| SEP 25 | 17.0°C | 15.2°C | |
| SEP 26 | 17.0°C | 15.3°C | |
| SEP 27 | 17.0°C | 15.4°C | |
| SEP 28 | 17.0°C | 15.5°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 | 6°C | 13°C | 19°C |
| June | 13°C | 19°C | 24°C |
| July | 16°C | 21°C | 26°C |
| August | 14°C | 20°C | 25°C |
| September | 11°C | 17°C | 22°C |
| October | 6°C | 10°C | 13°C |
| November | 2°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Lake Viljandi: Water Temperature by Location
Lake Viljandi: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Lake Viljandi (Viljandi järv) experiences clear seasonal variation in water temperature. In winter the lake is usually frozen or close to 0 °C (32 °F), while spring thaw brings temperatures up from near freezing to about 0–10 °C (32–50 °F) between March and May. Early summer commonly sees water in the range of 12–18 °C (54–64 °F), with mid- to late-summer temperatures often between 18 and 24 °C (64–75 °F) and occasional heat-wave peaks into the mid-20s °C (around 77–79 °F). Autumn cooling typically reduces temperatures back toward 5–10 °C (41–50 °F) before the lake freezes again. These ranges vary year to year with weather and wind conditions and are influenced by the lake’s depth and sheltered position.
Swimming at Lake Viljandi is generally permitted and popular at designated beaches and accessible shorelines, as the lake is a local recreational resource. Municipal authorities and environmental services monitor water quality, so swimming may be temporarily discouraged or restricted if tests show elevated bacteria or cyanobacterial blooms after warm, calm periods or heavy rains. Swimmers should follow posted signs and local guidance; be aware of variable temperatures outside high summer, submerged hazards, and the potential for cold-water shock in early summer and autumn.