Struma River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Struma River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Struma River today is 19.9°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 |
|---|---|---|---|
| SEP 13 | 22.0°C | 20.4°C | |
| SEP 14 | 22.4°C | 20.4°C | |
| SEP 15 | 21.1°C | 20.4°C | |
| SEP 16 | 20.5°C | 20.4°C | |
| SEP 17 | 20.4°C | 20.4°C | |
| SEP 18 | 20.2°C | 20.4°C | |
| SEP 19 | 19.5°C | 20.4°C | |
| SEP 20 | 19.7°C | 20.4°C | |
| SEP 21 | 20.4°C | 19.9°C | |
| SEP 22 | 20.4°C | 20.0°C | |
| SEP 23 | 20.4°C | 20.0°C | |
| SEP 24 | 20.4°C | 20.0°C | |
| SEP 25 | 20.4°C | 20.0°C | |
| SEP 26 | 20.4°C | 20.1°C | |
| SEP 27 | 20.4°C | 20.1°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 | 4°C | 8°C | 11°C |
| February | 5°C | 9°C | 11°C |
| March | 7°C | 11°C | 14°C |
| April | 9°C | 13°C | 17°C |
| May | 12°C | 17°C | 22°C |
| June | 15°C | 19°C | 24°C |
| July | 17°C | 22°C | 27°C |
| August | 18°C | 23°C | 28°C |
| September | 15°C | 20°C | 26°C |
| October | 12°C | 16°C | 18°C |
| November | 9°C | 13°C | 16°C |
| December | 5°C | 9°C | 11°C |
Struma River: Water Temperature by Location
Struma River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Source:
• location The south slopes of Vitosha, Bulgaria
• elevation 2,180 m (7,150 ft)
Mouth:
• location North Aegean Sea, Greece
• coordinates 40°47′9″N 23°50′56″E
Length 415 km (258 mi)
The Struma (Струма) River in Bulgaria exhibits notable seasonal variation in water temperature that depends on altitude and local conditions. In winter the river is cold, often between about 2–6 °C (36–43 °F) in lowland sections and closer to freezing in mountain streams. Spring brings warming and variability, typically around 6–15 °C (43–59 °F) as snowmelt and rains influence flow and temperature. In summer the lower, slower reaches can become pleasantly warm, commonly 18–26 °C (64–79 °F) and sometimes a few degrees higher in shallow side channels, while upland stretches remain cooler. Autumn sees gradual cooling, with temperatures usually falling back to roughly 10–18 °C (50–64 °F) depending on recent weather.
Swimming in the Struma is possible in many stretches, particularly in calm lowland pools and gently flowing sections during the warm months, but it is not universally recommended everywhere. Local restrictions may apply near dams, irrigation works and bridges, and water quality can decline after heavy rains or near urban effluents. Strong currents, variable depth, underwater obstacles and cold conditions outside summer are the main safety concerns, so swimmers should choose well-known, supervised spots, heed signage, and consider seasonal temperature effects on comfort and hypothermia risk.