Asopos River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Asopos River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Asopos River today is 19.8°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 |
|---|---|---|---|
| OCT 3 | 19.8°C | 16.0°C | |
| OCT 4 | 19.8°C | 16.0°C | |
| OCT 5 | 20.1°C | 16.0°C | |
| OCT 6 | 19.1°C | 16.0°C | |
| OCT 7 | 19.5°C | 16.0°C | |
| OCT 8 | 19.8°C | 16.0°C | |
| OCT 9 | 20.0°C | 16.0°C | |
| OCT 10 | 19.2°C | 16.0°C | |
| OCT 11 | 16.0°C | 19.6°C | |
| OCT 12 | 16.0°C | 19.4°C | |
| OCT 13 | 16.0°C | 19.2°C | |
| OCT 14 | 16.0°C | 19.0°C | |
| OCT 15 | 16.0°C | 18.9°C | |
| OCT 16 | 16.0°C | 18.7°C | |
| OCT 17 | 16.0°C | 18.5°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 | 6°C | 10°C | 14°C |
| February | 6°C | 9°C | 13°C |
| March | 6°C | 9°C | 12°C |
| April | 9°C | 13°C | 17°C |
| May | 13°C | 18°C | 22°C |
| June | 17°C | 21°C | 26°C |
| July | 18°C | 23°C | 29°C |
| August | 19°C | 24°C | 29°C |
| September | 18°C | 23°C | 28°C |
| October | 12°C | 16°C | 18°C |
| November | 9°C | 14°C | 19°C |
| December | 9°C | 13°C | 17°C |
Asopos River: Water Temperature by Location
Asopos River: Weather Forecast
October 11
October 12
October 13
October 14
October 15
Location & Local Information
Source:
• location Cithaeron mountain
Mouth:
• location South Euboean Gulf
• coordinates 38°20′7″N 23°44′28″E
Length 57 km (35 mi)
The Asopos (Ασωπός) River in the Attica-Boeotia border region shows marked seasonal variation in water temperature depending on flow, depth and recent weather. Typical surface temperatures in winter are roughly 8–12 °C (46–54 °F), rising through spring to about 12–18 °C (54–64 °F). In summer, when flows are lowest and insolation highest, shallow stretches can warm to roughly 20–26 °C (68–79 °F), while deeper pools remain cooler. Autumn temperatures generally fall back to the 12–20 °C (54–68 °F) range. These values are approximate; sudden rain, upstream releases or prolonged drought can push temperatures outside these bands, and measurements vary along the river’s course.
Swimming in the Asopos is not universally permitted or recommended. Several stretches have a history of industrial and agricultural pollution and intermittent contamination of surface and groundwater, so local authorities sometimes discourage contact recreation; moreover, uneven banks, hidden currents and private land access make many sections unsafe. In isolated, well‑flowing upstream reaches with clear water, people may swim, but it is prudent to consult recent local water‑quality reports, follow posted signage and respect landowners’ rules before entering the river.