Arunca River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Arunca River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Arunca River today is 19.3°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 14 | 19.9°C | 23.0°C | |
| SEP 15 | 20.3°C | 23.0°C | |
| SEP 16 | 20.4°C | 23.0°C | |
| SEP 17 | 20.7°C | 23.0°C | |
| SEP 18 | 20.3°C | 23.0°C | |
| SEP 19 | 19.4°C | 23.0°C | |
| SEP 20 | 19.0°C | 23.0°C | |
| SEP 21 | 19.3°C | 23.0°C | |
| SEP 22 | 23.0°C | 19.5°C | |
| SEP 23 | 23.0°C | 19.7°C | |
| SEP 24 | 23.0°C | 19.9°C | |
| SEP 25 | 23.0°C | 20.0°C | |
| SEP 26 | 23.0°C | 20.2°C | |
| SEP 27 | 23.0°C | 20.4°C | |
| SEP 28 | 23.0°C | 20.6°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 | 5°C | 8°C | 12°C |
| February | 7°C | 10°C | 13°C |
| March | 8°C | 11°C | 15°C |
| April | 9°C | 13°C | 18°C |
| May | 13°C | 18°C | 22°C |
| June | 17°C | 23°C | 28°C |
| July | 19°C | 24°C | 28°C |
| August | 20°C | 25°C | 28°C |
| September | 18°C | 23°C | 27°C |
| October | 13°C | 17°C | 19°C |
| November | 9°C | 13°C | 16°C |
| December | 8°C | 11°C | 14°C |
Arunca River: Water Temperature by Location
Arunca River: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
The Rio Arunca in the Coimbra district typically shows marked seasonal variation in water temperature. During winter months temperatures commonly sit around 8–12 °C (46–54 °F), reflecting cool Atlantic-influenced conditions and higher flows. Spring warming brings values of roughly 12–18 °C (54–64 °F) as flow decreases and air temperatures rise. In summer the river’s shallower pools and slower reaches can warm to about 18–25 °C (64–77 °F), occasionally reaching the high 20s °C (around 80 °F) in very shallow, sunlit basins during heatwaves. Autumn sees a gradual cooling back to approximately 12–18 °C (54–64 °F) as rainfall increases.
Recreational swimming in the Rio Arunca is commonly practiced in calm stretches and natural pools where access is convenient; there are no pervasive prohibitions across the river, but local rules, signage or seasonal restrictions can apply in specific locations. Whether swimming is advisable depends on water quality, flow conditions and safety factors—cold temperatures outside summer can increase the risk of cold shock, while higher flows after rain make some stretches hazardous. Visitors should therefore choose sheltered, low-current pools in warm months and heed any municipal notices or posted warnings.