Dão River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Dão River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Dão River today is 20.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 23 | 20.3°C | 22.5°C | |
| JUN 24 | 20.7°C | 22.5°C | |
| JUN 25 | 20.7°C | 22.5°C | |
| JUN 26 | 20.8°C | 22.5°C | |
| JUN 27 | 20.8°C | 22.5°C | |
| JUN 28 | 20.1°C | 22.5°C | |
| JUN 29 | 20.1°C | 22.5°C | |
| JUN 30 | 20.5°C | 22.5°C | |
| JUL 1 | 24.0°C | 20.7°C | |
| JUL 2 | 24.0°C | 20.9°C | |
| JUL 3 | 24.0°C | 21.0°C | |
| JUL 4 | 24.0°C | 21.2°C | |
| JUL 5 | 24.0°C | 21.4°C | |
| JUL 6 | 24.0°C | 21.6°C | |
| JUL 7 | 24.0°C | 21.7°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 | 5°C | 9°C | 11°C |
| February | 7°C | 10°C | 13°C |
| March | 8°C | 11°C | 14°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 | 7°C | 11°C | 14°C |
Dão River: Water Temperature by Location
Dão River: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
Source Eirado
• location Aguiar da Beira
• coordinates 40°47'09.4N 7°29'52.2W
• elevation 750 m
Mouth Mondego River
• location Foz do Dão, Santa Comba Dão
• coordinates 40°20'27.4N 8°10'51.2W
• elevation 110 - 124,7 m
The Dão River (Portuguese: Rio Dão) in the Guarda area is a small inland watercourse with relatively cool, clear water compared with coastal seas. Seasonal surface temperatures vary: in winter the river commonly sits around 6–12 °C (43–54 °F), spring brings 10–16 °C (50–61 °F) as flows moderate, summer daytime temperatures rise to roughly 18–24 °C (64–75 °F) in sheltered pools, and autumn typically sees 12–18 °C (54–64 °F) as rains increase. Upper reaches and shaded tributaries near higher elevations tend to be several degrees colder year-round, while shallow sun-exposed stretches warm more quickly in hot spells.
Swimming is practiced locally in informal bathing spots along the Dão, especially in summer when temperatures are most comfortable, but whether it is advisable depends on specific sites. There is no uniform prohibition, yet access can be restricted by private property, conservation rules, or safety signage; water quality varies with season and recent rainfall, and strong currents, hidden rocks or sudden depth changes can make some areas unsafe. Visitors should check local notices, prefer established access points, and be aware that even in summer the river remains cooler than coastal beaches, so short swims and caution are wise.