Beli Iskar Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Beli Iskar Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Beli Iskar Reservoir today is 14.2°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 |
|---|---|---|---|
| JUN 3 | 12.8°C | 12.0°C | |
| JUN 4 | 12.8°C | 12.0°C | |
| JUN 5 | 12.7°C | 12.0°C | |
| JUN 6 | 13.1°C | 12.0°C | |
| JUN 7 | 13.1°C | 12.0°C | |
| JUN 8 | 13.1°C | 12.0°C | |
| JUN 10 | 14.2°C | 12.0°C | |
| JUN 11 | 12.0°C | 14.1°C | |
| JUN 12 | 12.0°C | 14.0°C | |
| JUN 13 | 12.0°C | 13.9°C | |
| JUN 14 | 12.0°C | 13.8°C | |
| JUN 15 | 12.0°C | 13.7°C | |
| JUN 16 | 12.0°C | 13.5°C | |
| JUN 17 | 12.0°C | 13.4°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 | 2°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 4°C | 7°C |
| April | 0°C | 5°C | 9°C |
| May | 3°C | 9°C | 14°C |
| June | 7°C | 12°C | 18°C |
| July | 10°C | 15°C | 21°C |
| August | 10°C | 15°C | 21°C |
| September | 7°C | 12°C | 18°C |
| October | 5°C | 9°C | 12°C |
| November | 1°C | 5°C | 8°C |
| December | 0°C | 2°C | 5°C |
Beli Iskar Reservoir: Water Temperature by Location
Beli Iskar Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Beli Iskar Reservoir (Язовир Бели Искър) is a mountain reservoir whose water temperatures remain cool year-round because of elevation and shaded inflows. In winter the surface commonly approaches freezing, roughly 0–4 °C (32–39 °F), with ice possible in cold spells. Spring sees a gradual rise as snowmelt and runoff warm the basin to about 4–12 °C (39–54 °F). Peak summer temperatures are modest compared with lowland lakes, typically in the range of 12–20 °C (54–68 °F) on warm days; evenings and deeper layers stay noticeably colder. In autumn the water cools again to roughly 6–12 °C (43–54 °F) as air temperatures drop and inflows cool.
Swimming in the reservoir is physically possible during the warmer months, but it is not always encouraged or explicitly permitted. Many reservoirs, including Beli Iskar, are managed for water supply, flood control or hydroelectric purposes and may have restrictions to protect water quality and infrastructure. Cold, deep water, sudden drop-offs, submerged structures and lack of lifeguards create safety risks and increase the chance of cold-water shock. Local rules and signage determine whether bathing is allowed, so visitors should follow posted regulations and exercise caution if they choose to enter the water.