Zêzere River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Zêzere River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Zêzere River today is 17.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 2 | 19.9°C | 20.0°C | |
| JUN 3 | 18.6°C | 20.0°C | |
| JUN 4 | 18.4°C | 20.0°C | |
| JUN 5 | 18.4°C | 20.0°C | |
| JUN 6 | 18.3°C | 20.0°C | |
| JUN 7 | 18.0°C | 20.0°C | |
| JUN 8 | 17.6°C | 20.0°C | |
| JUN 10 | 20.0°C | 17.7°C | |
| JUN 11 | 20.0°C | 17.8°C | |
| JUN 12 | 20.0°C | 18.0°C | |
| JUN 13 | 20.0°C | 18.1°C | |
| JUN 14 | 20.0°C | 18.2°C | |
| JUN 15 | 20.0°C | 18.3°C | |
| JUN 16 | 20.0°C | 18.4°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 | 6°C | 9°C | 12°C |
| February | 6°C | 9°C | 13°C |
| March | 9°C | 12°C | 15°C |
| April | 9°C | 13°C | 18°C |
| May | 10°C | 15°C | 21°C |
| June | 16°C | 20°C | 25°C |
| July | 18°C | 23°C | 27°C |
| August | 18°C | 23°C | 27°C |
| September | 18°C | 22°C | 27°C |
| October | 14°C | 18°C | 20°C |
| November | 10°C | 14°C | 18°C |
| December | 8°C | 11°C | 14°C |
Zêzere River: Water Temperature by Location
Zêzere River: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
Source near Cântaro Magro
• location Serra da Estrela
• coordinates 40°19′50″N 7°35′49″W
• elevation 1,900 m (6,200 ft)
Mouth Tagus River
• location Constância
• coordinates 39°28′24″N 8°20′21″W
• elevation 20 m (66 ft)
Length 214 km (133 mi)
The Rio Zêzere in the Castelo Branco District typically shows pronounced seasonal variation in water temperature. In winter months the river water often ranges from about 6–10 °C (43–50 °F), which is brisk and can present a risk of cold-water shock. Spring temperatures usually rise to roughly 8–15 °C (46–59 °F) as snowmelt and rainfall feed the river. During summer, shallower stretches and slower-moving pools warm most, commonly reaching 18–25 °C (64–77 °F) and occasionally 26–28 °C (79–82 °F) during prolonged heat waves. Autumn cooling tends to bring temperatures back to roughly 12–18 °C (54–64 °F) as flows increase again.
Swimming in the Zêzere is possible in many accessible sections, particularly where local authorities or communities maintain informal beaches or designated bathing areas with adequate water quality. However, swimming is not universally permitted or safe along the whole river: sudden currents, submerged hazards, and regulated dam releases can make some stretches dangerous, and occasional declines in water quality may lead to temporary restrictions. Visitors should follow local signage, check for monitored bathing zones, and be mindful of seasonal temperature-related risks such as hypothermia in cooler months and reduced buoyancy in colder water.