Bolu — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bolu, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bolu today is 19.5°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 | 20.6°C | 23.0°C | |
| SEP 14 | 21.1°C | 23.0°C | |
| SEP 15 | 21.8°C | 23.0°C | |
| SEP 16 | 20.6°C | 23.0°C | |
| SEP 17 | 20.8°C | 23.0°C | |
| SEP 18 | 20.5°C | 23.0°C | |
| SEP 19 | 20.5°C | 23.0°C | |
| SEP 20 | 19.4°C | 23.0°C | |
| SEP 21 | 23.0°C | 19.7°C | |
| SEP 22 | 23.0°C | 19.9°C | |
| SEP 23 | 23.0°C | 20.0°C | |
| SEP 24 | 23.0°C | 20.2°C | |
| SEP 25 | 23.0°C | 20.4°C | |
| SEP 26 | 23.0°C | 20.6°C | |
| SEP 27 | 23.0°C | 20.7°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 | 3°C | 7°C | 10°C |
| February | 5°C | 9°C | 12°C |
| March | 5°C | 9°C | 13°C |
| April | 8°C | 12°C | 15°C |
| May | 11°C | 17°C | 22°C |
| June | 18°C | 25°C | 31°C |
| July | 19°C | 24°C | 29°C |
| August | 20°C | 25°C | 30°C |
| September | 18°C | 23°C | 28°C |
| October | 12°C | 16°C | 19°C |
| November | 8°C | 12°C | 15°C |
| December | 4°C | 9°C | 13°C |
Bolu: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Bolu province, set in Turkey’s inland highlands, hosts a number of small mountain lakes and fast-flowing rivers whose water temperatures remain relatively cool year round. Surface temperatures in lakes such as Abant, Gölcük and the Yedigöller group typically range from about 0–4 °C (32–39 °F) in winter to roughly 12–22 °C (54–72 °F) at the warmest points of summer, with spring and autumn values often between 4–12 °C (39–54 °F). Rivers fed by springs and snowmelt are colder and more variable: winter temperatures near freezing are common, spring runoff yields 4–12 °C (39–54 °F), and summer highs in sheltered stretches may reach about 8–18 °C (46–64 °F) before cooling again in autumn.
Swimming opportunities are therefore limited by both temperature and conservation or safety rules. Many of the well-known lakes lie inside protected park areas where bathing is discouraged or officially prohibited to preserve water quality and habitats; in addition, cold water and strong currents in rivers increase hypothermia and drowning risks and there are few designated lifeguarded sites. In warm summer spells locals sometimes wade or swim in calmer sections, but formal, safe swimming spots are uncommon and visitors should heed local regulations and seasonal conditions.